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

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



source_headers: assay_id
assay_tissue
curated_by
description
src_id
variant_id
target_headers: assays_assay_id
assays_assay_tissue
assays_curated_by
assays_description
assays_src_id
assays_variant_id
column_mappings: assay_id
assays_assay_id
assay_tissue
assays_assay_tissue
curated_by
assays_curated_by
description
assays_description
src_id
assays_src_id
variant_id
assays_variant_id
output: {"column_mappings": [["assay_id", "assays_assay_id"], ["assay_tissue", "assays_assay_tissue"], ["curated_by", "assays_curated_by"], ["description", "assays_description"], ["src_id", "assays_src_id"], ["variant_id", "assays_variant_id"], ["doc_id", null], ["assay_type", null], ["assay_test_type", null], ["assay_category", null], ["assay_organism", null], ["assay_tax_id", null], ["assay_strain", null], ["assay_cell_type", null]]}