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

TableB:
|   assay_id | assay_subcellular_fraction   | assay_organism    | description                                                                                              | relationship_type   | assay_type   |   confidence_score | curated_by   |   src_id | src_assay_id   | chembl_id    | cell_id   | bao_format   | tissue_id   | variant_id   |
|-----------:|:-----------------------------|:------------------|:---------------------------------------------------------------------------------------------------------|:--------------------|:-------------|-------------------:|:-------------|---------:|:---------------|:-------------|:----------|:-------------|:------------|:-------------|
|       7524 |                              | Rattus norvegicus | Biodistribution in normal rat kidney in the presence of 0.005 M Gd/0.01 M lig at 2 hr                    | N                   | A            |                  1 | Intermediate |        1 |                | CHEMBL618647 |           | BAO_0000218  | 2113.0      |              |
|       7525 |                              | Rattus norvegicus | Biodistribution in normal rat kidney in the presence of 0.01 M Gd/0.05 M lig                             | N                   | A            |                  1 | Intermediate |        1 |                | CHEMBL618648 |           | BAO_0000218  | 2113.0      |              |
|       7526 |                              | Rattus norvegicus | Biodistribution in normal rat kidney in the presence of NAC Gd 0.01 M lig at 2 hr                        | N                   | A            |                  1 | Intermediate |        1 |                | CHEMBL618649 |           | BAO_0000218  | 2113.0      |              |
|       7527 |                              | Rattus norvegicus | Biodistribution in normal rat liver in the presence of 0.005 M Gd/0.01 M lig at 2 hr                     | N                   | A            |                  1 | Intermediate |        1 |                | CHEMBL618650 |           | BAO_0000218  | 2107.0      |              |
|       7528 |                              | Rattus norvegicus | Biodistribution in normal rat liver in the presence of 0.01 M Gd/0.05 M lig                              | N                   | A            |                  1 | Intermediate |        1 |                | CHEMBL618651 |           | BAO_0000218  | 2107.0      |              |
|       7529 |                              | Rattus norvegicus | Biodistribution in normal rat liver in the presence of NAC Gd 0.01 M lig at 2 hr                         | N                   | A            |                  1 | Intermediate |        1 |                | CHEMBL876497 |           | BAO_0000218  | 2107.0      |              |
|       7530 |                              | Rattus norvegicus | Biodistribution in normal rat lung in the presence of 0.005 M Gd/0.01 M lig at 2 hr                      | N                   | A            |                  1 | Intermediate |        1 |                | CHEMBL618652 |           | BAO_0000218  | 2048.0      |              |
|       7531 |                              | Rattus norvegicus | Biodistribution in normal rat lung in the presence of 0.01 M Gd/0.05 M lig                               | N                   | A            |                  1 | Intermediate |        1 |                | CHEMBL618653 |           | BAO_0000218  | 2048.0      |              |
|       7532 |                              | Rattus norvegicus | Biodistribution in normal rat lung in the presence of NAC Gd 0.01 M lig at 2 hr                          | N                   | A            |                  1 | Intermediate |        1 |                | CHEMBL618654 |           | BAO_0000218  | 2048.0      |              |
|       7533 |                              | Rattus norvegicus | Recovery rate from urine and bile was determined after iv administration at 20 mg/kg in rats; Not tested | N                   | A            |                  1 | Intermediate |        1 |                | CHEMBL618655 |           | BAO_0000218  |             |              |



source_headers: assay_id
assay_subcellular_fraction
assay_organism
description
relationship_type
assay_type
target_headers: assay_id
assay_subcellular_fraction
assay_organism
description
relationship_type
assay_type
column_mappings: assay_id
assay_id
assay_subcellular_fraction
assay_subcellular_fraction
assay_organism
assay_organism
description
description
relationship_type
relationship_type
assay_type
assay_type
output: {"column_mappings": [["assay_id", "assay_id"], ["assay_subcellular_fraction", "assay_subcellular_fraction"], ["assay_organism", "assay_organism"], ["description", "description"], ["relationship_type", "relationship_type"], ["assay_type", "assay_type"], ["doc_id", null], ["assay_test_type", null], ["assay_category", null], ["assay_tax_id", null], ["assay_strain", null], ["assay_tissue", null], ["assay_cell_type", null], ["tid", null]]}