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

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



source_headers: assay_id
assay_organism
chembl_id
curated_by
assay_tissue
description
assay_category
relationship_type
assay_tax_id
doc_id
tid
target_headers: assays_assay_id
assays_assay_organism
assays_chembl_id
assays_curated_by
assays_assay_tissue
assays_description
assays_assay_category
assays_relationship_type
assays_assay_tax_id
assays_doc_id
assays_tid
column_mappings: assay_id
assays_assay_id
assay_organism
assays_assay_organism
chembl_id
assays_chembl_id
curated_by
assays_curated_by
assay_tissue
assays_assay_tissue
description
assays_description
assay_category
assays_assay_category
relationship_type
assays_relationship_type
assay_tax_id
assays_assay_tax_id
doc_id
assays_doc_id
tid
assays_tid
output: {"column_mappings": [["assay_id", "assays_assay_id"], ["assay_organism", "assays_assay_organism"], ["chembl_id", "assays_chembl_id"], ["curated_by", "assays_curated_by"], ["assay_tissue", "assays_assay_tissue"], ["description", "assays_description"], ["assay_category", "assays_assay_category"], ["relationship_type", "assays_relationship_type"], ["assay_tax_id", "assays_assay_tax_id"], ["doc_id", "assays_doc_id"], ["tid", "assays_tid"], ["assay_type", null], ["assay_test_type", null], ["assay_strain", null], ["assay_cell_type", null], ["assay_subcellular_fraction", null], ["confidence_score", null]]}