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_test_type   | bao_format   | tissue_id   | cell_id   |   doc_id | description                                                                                                 | assay_type   | assay_category   | assay_organism   | assay_tax_id   | assay_strain   | assay_tissue   |
|-----------:|:-----------------------------|:------------------|:-------------|:------------|:----------|---------:|:------------------------------------------------------------------------------------------------------------|:-------------|:-----------------|:-----------------|:---------------|:---------------|:---------------|
|          1 |                              |                   | BAO_0000019  |             |           |    11087 | The compound was tested for the in vitro inhibition of platelet 12-lipoxygenase at a concentration of 30 uM | B            |                  |                  |                |                |                |
|          2 |                              |                   | BAO_0000219  |             |           |      684 | Compound was evaluated for its ability to mobilize calcium in 1321NI cells                                  | F            |                  |                  |                |                |                |
|          3 |                              |                   | BAO_0000019  |             |           |    15453 |                                                                                                             | B            |                  |                  |                |                |                |
|          4 |                              |                   | BAO_0000249  |             |           |    17841 | Binding affinity against A2 adenosine receptor in bovine striatal membranes using [3H]CGS-21680             | B            |                  | Bos taurus       | 9913.0         |                |                |
|          5 |                              |                   | BAO_0000219  |             | 163.0     |    17430 | In vitro cell cytotoxicity against 143-B cell lines (Human osteosarcoma cell line)                          | F            |                  | Homo sapiens     | 9606.0         |                |                |
|          6 |                              |                   | BAO_0000219  |             | 163.0     |    17430 | In vitro cell cytotoxicity against 143-B cell lines (Human osteosarcoma cell line)                          | F            |                  | Homo sapiens     | 9606.0         |                |                |
|          7 |                              |                   | BAO_0000219  |             | 163.0     |    13799 | Cytotoxic Activity was evaluated against 143B (TK-) tumor cells                                             | F            |                  | Mus musculus     | 10090.0        |                |                |
|          8 |                              |                   | BAO_0000219  |             | 163.0     |    17774 | In vitro cell cytotoxicity was determined against 143B cell line                                            | F            |                  | Homo sapiens     | 9606.0         |                |                |
|          9 |                              |                   | BAO_0000219  |             | 163.0     |     3801 | Inhibitory activity against tumor osteosarcoma cell line 143B after 72 hr continuous exposure to compound   | F            |                  | Homo sapiens     | 9606.0         |                |                |
|         10 |                              |                   | BAO_0000219  |             | 163.0     |    17430 | In vitro cell cytotoxicity against 143B-LTK cell lines expressed in HSV-1 TK                                | F            |                  | Homo sapiens     | 9606.0         |                |                |

TableB:
|   assays_ASSI | assays_ASSUBCFRA   | assays_ASTTY   | assays_BAFO   | assays_TISI   | assays_CEI   | assays_ASCTY   |   assays_T | assays_RELT   |   assays_CONFISC | assays_CUB   |   assays_SI | assays_SASSI   | assays_CHI   | assays_VARI   |
|--------------:|:-------------------|:---------------|:--------------|:--------------|:-------------|:---------------|-----------:|:--------------|-----------------:|:-------------|------------:|:---------------|:-------------|:--------------|
|          7524 |                    | In vivo        | BAO_0000218   | 2113.0        |              |                |      50597 | N             |                1 | Intermediate |           1 |                | CHEMBL618647 |               |
|          7525 |                    | In vivo        | BAO_0000218   | 2113.0        |              |                |      50597 | N             |                1 | Intermediate |           1 |                | CHEMBL618648 |               |
|          7526 |                    | In vivo        | BAO_0000218   | 2113.0        |              |                |      50597 | N             |                1 | Intermediate |           1 |                | CHEMBL618649 |               |
|          7527 |                    | In vivo        | BAO_0000218   | 2107.0        |              |                |      50597 | N             |                1 | Intermediate |           1 |                | CHEMBL618650 |               |
|          7528 |                    | In vivo        | BAO_0000218   | 2107.0        |              |                |      50597 | N             |                1 | Intermediate |           1 |                | CHEMBL618651 |               |
|          7529 |                    | In vivo        | BAO_0000218   | 2107.0        |              |                |      50597 | N             |                1 | Intermediate |           1 |                | CHEMBL876497 |               |
|          7530 |                    | In vivo        | BAO_0000218   | 2048.0        |              |                |      50597 | N             |                1 | Intermediate |           1 |                | CHEMBL618652 |               |
|          7531 |                    | In vivo        | BAO_0000218   | 2048.0        |              |                |      50597 | N             |                1 | Intermediate |           1 |                | CHEMBL618653 |               |
|          7532 |                    | In vivo        | BAO_0000218   | 2048.0        |              |                |      50597 | N             |                1 | Intermediate |           1 |                | CHEMBL618654 |               |
|          7533 |                    |                | BAO_0000218   |               |              |                |      50597 | N             |                1 | Intermediate |           1 |                | CHEMBL618655 |               |



source_headers: assay_id
assay_subcellular_fraction
assay_test_type
bao_format
tissue_id
cell_id
target_headers: assays_ASSI
assays_ASSUBCFRA
assays_ASTTY
assays_BAFO
assays_TISI
assays_CEI
column_mappings: assay_id
assays_ASSI
assay_subcellular_fraction
assays_ASSUBCFRA
assay_test_type
assays_ASTTY
bao_format
assays_BAFO
tissue_id
assays_TISI
cell_id
assays_CEI
output: {"column_mappings": [["assay_id", "assays_ASSI"], ["assay_subcellular_fraction", "assays_ASSUBCFRA"], ["assay_test_type", "assays_ASTTY"], ["bao_format", "assays_BAFO"], ["tissue_id", "assays_TISI"], ["cell_id", "assays_CEI"], ["doc_id", null], ["description", null], ["assay_type", null], ["assay_category", null], ["assay_organism", null], ["assay_tax_id", null], ["assay_strain", null], ["assay_tissue", null]]}