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

TableB:
|   assay_id |   tid | relationship_type   |   confidence_score | curated_by   |   src_id | src_assay_id   | chembl_id    | cell_id   | bao_format   | tissue_id   | variant_id   |
|-----------:|------:|:--------------------|-------------------:|:-------------|---------:|:---------------|:-------------|:----------|:-------------|:------------|:-------------|
|       7524 | 50597 | N                   |                  1 | Intermediate |        1 |                | CHEMBL618647 |           | BAO_0000218  | 2113.0      |              |
|       7525 | 50597 | N                   |                  1 | Intermediate |        1 |                | CHEMBL618648 |           | BAO_0000218  | 2113.0      |              |
|       7526 | 50597 | N                   |                  1 | Intermediate |        1 |                | CHEMBL618649 |           | BAO_0000218  | 2113.0      |              |
|       7527 | 50597 | N                   |                  1 | Intermediate |        1 |                | CHEMBL618650 |           | BAO_0000218  | 2107.0      |              |
|       7528 | 50597 | N                   |                  1 | Intermediate |        1 |                | CHEMBL618651 |           | BAO_0000218  | 2107.0      |              |
|       7529 | 50597 | N                   |                  1 | Intermediate |        1 |                | CHEMBL876497 |           | BAO_0000218  | 2107.0      |              |
|       7530 | 50597 | N                   |                  1 | Intermediate |        1 |                | CHEMBL618652 |           | BAO_0000218  | 2048.0      |              |
|       7531 | 50597 | N                   |                  1 | Intermediate |        1 |                | CHEMBL618653 |           | BAO_0000218  | 2048.0      |              |
|       7532 | 50597 | N                   |                  1 | Intermediate |        1 |                | CHEMBL618654 |           | BAO_0000218  | 2048.0      |              |
|       7533 | 50597 | N                   |                  1 | Intermediate |        1 |                | CHEMBL618655 |           | BAO_0000218  |             |              |



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