Task: Schema-Matching (source dataset: assays)

Task: 
Please identify the matching columns between Table A and Table B. For each column in Table A, specify the corresponding column in Table B. If a column in A has no corresponding column in Table B, you can map it to null. Represent each column mapping using a pair of column headers in a list, i.e., [Table A Column, Table B column or null]. Provide the mapping for each column in Table A and return all mappings in a list.

No explanation and return the matching columns in a structured JSON format: {"column_mappings": <a list of column pairs>}.

TableA:
|   assay_id |   doc_id | description                                                                                                 | assay_type   | assay_test_type   | assay_category   | assay_organism   | assay_tax_id   | assay_strain   | assay_tissue   | assay_cell_type   | assay_subcellular_fraction   |    tid | relationship_type   |   confidence_score | curated_by   |   src_id | src_assay_id   | chembl_id    | cell_id   | bao_format   | tissue_id   | variant_id   |
|-----------:|---------:|:------------------------------------------------------------------------------------------------------------|:-------------|:------------------|:-----------------|:-----------------|:---------------|:---------------|:---------------|:------------------|:-----------------------------|-------:|:--------------------|-------------------:|:-------------|---------:|:---------------|:-------------|:----------|:-------------|:------------|:-------------|
|          1 |    11087 | The compound was tested for the in vitro inhibition of platelet 12-lipoxygenase at a concentration of 30 uM | B            |                   |                  |                  |                |                |                |                   |                              |  12052 | H                   |                  8 | Autocuration |        1 |                | CHEMBL615117 |           | BAO_0000019  |             |              |
|          2 |      684 | Compound was evaluated for its ability to mobilize calcium in 1321NI cells                                  | F            |                   |                  |                  |                |                |                |                   |                              |  22226 | U                   |                  0 | Autocuration |        1 |                | CHEMBL615118 |           | BAO_0000219  |             |              |
|          3 |    15453 |                                                                                                             | B            |                   |                  |                  |                |                |                |                   |                              |  22226 | U                   |                  0 | Autocuration |        1 |                | CHEMBL615119 |           | BAO_0000019  |             |              |
|          4 |    17841 | Binding affinity against A2 adenosine receptor in bovine striatal membranes using [3H]CGS-21680             | B            |                   |                  | Bos taurus       | 9913.0         |                |                |                   |                              | 104729 | H                   |                  4 | Autocuration |        1 |                | CHEMBL615120 |           | BAO_0000249  |             |              |
|          5 |    17430 | In vitro cell cytotoxicity against 143-B cell lines (Human osteosarcoma cell line)                          | F            |                   |                  | Homo sapiens     | 9606.0         |                |                | 143B              |                              |  80001 | N                   |                  1 | Intermediate |        1 |                | CHEMBL615121 | 163.0     | BAO_0000219  |             |              |
|          6 |    17430 | In vitro cell cytotoxicity against 143-B cell lines (Human osteosarcoma cell line)                          | F            |                   |                  | Homo sapiens     | 9606.0         |                |                | 143B              |                              |  80001 | N                   |                  1 | Intermediate |        1 |                | CHEMBL615122 | 163.0     | BAO_0000219  |             |              |
|          7 |    13799 | Cytotoxic Activity was evaluated against 143B (TK-) tumor cells                                             | F            |                   |                  | Mus musculus     | 10090.0        |                |                | 143B              |                              |  80001 | N                   |                  1 | Intermediate |        1 |                | CHEMBL615123 | 163.0     | BAO_0000219  |             |              |
|          8 |    17774 | In vitro cell cytotoxicity was determined against 143B cell line                                            | F            |                   |                  | Homo sapiens     | 9606.0         |                |                | 143B              |                              |  80001 | N                   |                  1 | Expert       |        1 |                | CHEMBL615124 | 163.0     | BAO_0000219  |             |              |
|          9 |     3801 | Inhibitory activity against tumor osteosarcoma cell line 143B after 72 hr continuous exposure to compound   | F            |                   |                  | Homo sapiens     | 9606.0         |                |                | 143B              |                              |  80001 | N                   |                  1 | Intermediate |        1 |                | CHEMBL615125 | 163.0     | BAO_0000219  |             |              |
|         10 |    17430 | In vitro cell cytotoxicity against 143B-LTK cell lines expressed in HSV-1 TK                                | F            |                   |                  | Homo sapiens     | 9606.0         |                |                | 143B              |                              |  80001 | N                   |                  1 | Intermediate |        1 |                | CHEMBL615126 | 163.0     | BAO_0000219  |             |              |

TableB:
|   assays_assay_id |   assays_doc_id | assays_description                                                                                       | assays_assay_type   | assays_assay_test_type   | assays_assay_category   | assays_assay_organism   |   assays_assay_tax_id | assays_assay_strain   | assays_assay_tissue   | assays_assay_cell_type   | assays_assay_subcellular_fraction   |   assays_tid | assays_relationship_type   |   assays_confidence_score | assays_curated_by   |   assays_src_id | assays_src_assay_id   | assays_chembl_id   | assays_cell_id   | assays_bao_format   | assays_tissue_id   | assays_variant_id   |
|------------------:|----------------:|:---------------------------------------------------------------------------------------------------------|:--------------------|:-------------------------|:------------------------|:------------------------|----------------------:|:----------------------|:----------------------|:-------------------------|:------------------------------------|-------------:|:---------------------------|--------------------------:|:--------------------|----------------:|:----------------------|:-------------------|:-----------------|:--------------------|:-------------------|:--------------------|
|              7524 |            9866 | Biodistribution in normal rat kidney in the presence of 0.005 M Gd/0.01 M lig at 2 hr                    | A                   | In vivo                  |                         | Rattus norvegicus       |                 10116 |                       | Kidney                |                          |                                     |        50597 | N                          |                         1 | Intermediate        |               1 |                       | CHEMBL618647       |                  | BAO_0000218         | 2113.0             |                     |
|              7525 |            9866 | Biodistribution in normal rat kidney in the presence of 0.01 M Gd/0.05 M lig                             | A                   | In vivo                  |                         | Rattus norvegicus       |                 10116 |                       | Kidney                |                          |                                     |        50597 | N                          |                         1 | Intermediate        |               1 |                       | CHEMBL618648       |                  | BAO_0000218         | 2113.0             |                     |
|              7526 |            9866 | Biodistribution in normal rat kidney in the presence of NAC Gd 0.01 M lig at 2 hr                        | A                   | In vivo                  |                         | Rattus norvegicus       |                 10116 |                       | Kidney                |                          |                                     |        50597 | N                          |                         1 | Intermediate        |               1 |                       | CHEMBL618649       |                  | BAO_0000218         | 2113.0             |                     |
|              7527 |            9866 | Biodistribution in normal rat liver in the presence of 0.005 M Gd/0.01 M lig at 2 hr                     | A                   | In vivo                  |                         | Rattus norvegicus       |                 10116 |                       | Liver                 |                          |                                     |        50597 | N                          |                         1 | Intermediate        |               1 |                       | CHEMBL618650       |                  | BAO_0000218         | 2107.0             |                     |
|              7528 |            9866 | Biodistribution in normal rat liver in the presence of 0.01 M Gd/0.05 M lig                              | A                   | In vivo                  |                         | Rattus norvegicus       |                 10116 |                       | Liver                 |                          |                                     |        50597 | N                          |                         1 | Intermediate        |               1 |                       | CHEMBL618651       |                  | BAO_0000218         | 2107.0             |                     |
|              7529 |            9866 | Biodistribution in normal rat liver in the presence of NAC Gd 0.01 M lig at 2 hr                         | A                   | In vivo                  |                         | Rattus norvegicus       |                 10116 |                       | Liver                 |                          |                                     |        50597 | N                          |                         1 | Intermediate        |               1 |                       | CHEMBL876497       |                  | BAO_0000218         | 2107.0             |                     |
|              7530 |            9866 | Biodistribution in normal rat lung in the presence of 0.005 M Gd/0.01 M lig at 2 hr                      | A                   | In vivo                  |                         | Rattus norvegicus       |                 10116 |                       | Lung                  |                          |                                     |        50597 | N                          |                         1 | Intermediate        |               1 |                       | CHEMBL618652       |                  | BAO_0000218         | 2048.0             |                     |
|              7531 |            9866 | Biodistribution in normal rat lung in the presence of 0.01 M Gd/0.05 M lig                               | A                   | In vivo                  |                         | Rattus norvegicus       |                 10116 |                       | Lung                  |                          |                                     |        50597 | N                          |                         1 | Intermediate        |               1 |                       | CHEMBL618653       |                  | BAO_0000218         | 2048.0             |                     |
|              7532 |            9866 | Biodistribution in normal rat lung in the presence of NAC Gd 0.01 M lig at 2 hr                          | A                   | In vivo                  |                         | Rattus norvegicus       |                 10116 |                       | Lung                  |                          |                                     |        50597 | N                          |                         1 | Intermediate        |               1 |                       | CHEMBL618654       |                  | BAO_0000218         | 2048.0             |                     |
|              7533 |            6351 | Recovery rate from urine and bile was determined after iv administration at 20 mg/kg in rats; Not tested | A                   |                          |                         | Rattus norvegicus       |                 10116 |                       |                       |                          |                                     |        50597 | N                          |                         1 | Intermediate        |               1 |                       | CHEMBL618655       |                  | BAO_0000218         |                    |                     |



source_headers: assay_id
doc_id
description
assay_type
assay_test_type
assay_category
assay_organism
assay_tax_id
assay_strain
assay_tissue
assay_cell_type
assay_subcellular_fraction
tid
relationship_type
confidence_score
curated_by
src_id
src_assay_id
chembl_id
cell_id
bao_format
tissue_id
variant_id
target_headers: assays_assay_id
assays_doc_id
assays_description
assays_assay_type
assays_assay_test_type
assays_assay_category
assays_assay_organism
assays_assay_tax_id
assays_assay_strain
assays_assay_tissue
assays_assay_cell_type
assays_assay_subcellular_fraction
assays_tid
assays_relationship_type
assays_confidence_score
assays_curated_by
assays_src_id
assays_src_assay_id
assays_chembl_id
assays_cell_id
assays_bao_format
assays_tissue_id
assays_variant_id
column_mappings: assay_id
assays_assay_id
doc_id
assays_doc_id
description
assays_description
assay_type
assays_assay_type
assay_test_type
assays_assay_test_type
assay_category
assays_assay_category
assay_organism
assays_assay_organism
assay_tax_id
assays_assay_tax_id
assay_strain
assays_assay_strain
assay_tissue
assays_assay_tissue
assay_cell_type
assays_assay_cell_type
assay_subcellular_fraction
assays_assay_subcellular_fraction
tid
assays_tid
relationship_type
assays_relationship_type
confidence_score
assays_confidence_score
curated_by
assays_curated_by
src_id
assays_src_id
src_assay_id
assays_src_assay_id
chembl_id
assays_chembl_id
cell_id
assays_cell_id
bao_format
assays_bao_format
tissue_id
assays_tissue_id
variant_id
assays_variant_id
output: {"column_mappings": [["assay_id", "assays_assay_id"], ["doc_id", "assays_doc_id"], ["description", "assays_description"], ["assay_type", "assays_assay_type"], ["assay_test_type", "assays_assay_test_type"], ["assay_category", "assays_assay_category"], ["assay_organism", "assays_assay_organism"], ["assay_tax_id", "assays_assay_tax_id"], ["assay_strain", "assays_assay_strain"], ["assay_tissue", "assays_assay_tissue"], ["assay_cell_type", "assays_assay_cell_type"], ["assay_subcellular_fraction", "assays_assay_subcellular_fraction"], ["tid", "assays_tid"], ["relationship_type", "assays_relationship_type"], ["confidence_score", "assays_confidence_score"], ["curated_by", "assays_curated_by"], ["src_id", "assays_src_id"], ["src_assay_id", "assays_src_assay_id"], ["chembl_id", "assays_chembl_id"], ["cell_id", "assays_cell_id"], ["bao_format", "assays_bao_format"], ["tissue_id", "assays_tissue_id"], ["variant_id", "assays_variant_id"]]}