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

TableB:
|   assays_ASSI |   assays_CONSC | assays_VARI   | assays_TISI   | assays_RELATIT   | assays_CURAB   | assays_ASSTIS   | assays_ASSCET   | assays_ASSSUBCELFR   |   assays_Ti |   assays_SI | assays_SRASI   | assays_CHEI   | assays_CEI   | assays_BFO   |
|--------------:|---------------:|:--------------|:--------------|:-----------------|:---------------|:----------------|:----------------|:---------------------|------------:|------------:|:---------------|:--------------|:-------------|:-------------|
|          7524 |              1 |               | 2113.0        | N                | Intermediate   | Kidney          |                 |                      |       50597 |           1 |                | CHEMBL618647  |              | BAO_0000218  |
|          7525 |              1 |               | 2113.0        | N                | Intermediate   | Kidney          |                 |                      |       50597 |           1 |                | CHEMBL618648  |              | BAO_0000218  |
|          7526 |              1 |               | 2113.0        | N                | Intermediate   | Kidney          |                 |                      |       50597 |           1 |                | CHEMBL618649  |              | BAO_0000218  |
|          7527 |              1 |               | 2107.0        | N                | Intermediate   | Liver           |                 |                      |       50597 |           1 |                | CHEMBL618650  |              | BAO_0000218  |
|          7528 |              1 |               | 2107.0        | N                | Intermediate   | Liver           |                 |                      |       50597 |           1 |                | CHEMBL618651  |              | BAO_0000218  |
|          7529 |              1 |               | 2107.0        | N                | Intermediate   | Liver           |                 |                      |       50597 |           1 |                | CHEMBL876497  |              | BAO_0000218  |
|          7530 |              1 |               | 2048.0        | N                | Intermediate   | Lung            |                 |                      |       50597 |           1 |                | CHEMBL618652  |              | BAO_0000218  |
|          7531 |              1 |               | 2048.0        | N                | Intermediate   | Lung            |                 |                      |       50597 |           1 |                | CHEMBL618653  |              | BAO_0000218  |
|          7532 |              1 |               | 2048.0        | N                | Intermediate   | Lung            |                 |                      |       50597 |           1 |                | CHEMBL618654  |              | BAO_0000218  |
|          7533 |              1 |               |               | N                | Intermediate   |                 |                 |                      |       50597 |           1 |                | CHEMBL618655  |              | BAO_0000218  |



source_headers: assay_id
confidence_score
variant_id
tissue_id
relationship_type
curated_by
target_headers: assays_ASSI
assays_CONSC
assays_VARI
assays_TISI
assays_RELATIT
assays_CURAB
column_mappings: assay_id
assays_ASSI
confidence_score
assays_CONSC
variant_id
assays_VARI
tissue_id
assays_TISI
relationship_type
assays_RELATIT
curated_by
assays_CURAB
output: {"column_mappings": [["assay_id", "assays_ASSI"], ["confidence_score", "assays_CONSC"], ["variant_id", "assays_VARI"], ["tissue_id", "assays_TISI"], ["relationship_type", "assays_RELATIT"], ["curated_by", "assays_CURAB"], ["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]]}