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

TableB:
|   ASI | Des                                                                                                      | SASI   | ASCTY   | CEI   | ASTI   |     T | RELATITY   |   CONFSCO | CURAB        |   SRI | CHEI         | BAFO        | TISI   | VARI   |
|------:|:---------------------------------------------------------------------------------------------------------|:-------|:--------|:------|:-------|------:|:-----------|----------:|:-------------|------:|:-------------|:------------|:-------|:-------|
|  7524 | Biodistribution in normal rat kidney in the presence of 0.005 M Gd/0.01 M lig at 2 hr                    |        |         |       | Kidney | 50597 | N          |         1 | Intermediate |     1 | CHEMBL618647 | BAO_0000218 | 2113.0 |        |
|  7525 | Biodistribution in normal rat kidney in the presence of 0.01 M Gd/0.05 M lig                             |        |         |       | Kidney | 50597 | N          |         1 | Intermediate |     1 | CHEMBL618648 | BAO_0000218 | 2113.0 |        |
|  7526 | Biodistribution in normal rat kidney in the presence of NAC Gd 0.01 M lig at 2 hr                        |        |         |       | Kidney | 50597 | N          |         1 | Intermediate |     1 | CHEMBL618649 | BAO_0000218 | 2113.0 |        |
|  7527 | Biodistribution in normal rat liver in the presence of 0.005 M Gd/0.01 M lig at 2 hr                     |        |         |       | Liver  | 50597 | N          |         1 | Intermediate |     1 | CHEMBL618650 | BAO_0000218 | 2107.0 |        |
|  7528 | Biodistribution in normal rat liver in the presence of 0.01 M Gd/0.05 M lig                              |        |         |       | Liver  | 50597 | N          |         1 | Intermediate |     1 | CHEMBL618651 | BAO_0000218 | 2107.0 |        |
|  7529 | Biodistribution in normal rat liver in the presence of NAC Gd 0.01 M lig at 2 hr                         |        |         |       | Liver  | 50597 | N          |         1 | Intermediate |     1 | CHEMBL876497 | BAO_0000218 | 2107.0 |        |
|  7530 | Biodistribution in normal rat lung in the presence of 0.005 M Gd/0.01 M lig at 2 hr                      |        |         |       | Lung   | 50597 | N          |         1 | Intermediate |     1 | CHEMBL618652 | BAO_0000218 | 2048.0 |        |
|  7531 | Biodistribution in normal rat lung in the presence of 0.01 M Gd/0.05 M lig                               |        |         |       | Lung   | 50597 | N          |         1 | Intermediate |     1 | CHEMBL618653 | BAO_0000218 | 2048.0 |        |
|  7532 | Biodistribution in normal rat lung in the presence of NAC Gd 0.01 M lig at 2 hr                          |        |         |       | Lung   | 50597 | N          |         1 | Intermediate |     1 | CHEMBL618654 | BAO_0000218 | 2048.0 |        |
|  7533 | Recovery rate from urine and bile was determined after iv administration at 20 mg/kg in rats; Not tested |        |         |       |        | 50597 | N          |         1 | Intermediate |     1 | CHEMBL618655 | BAO_0000218 |        |        |



source_headers: assay_id
description
src_assay_id
assay_cell_type
cell_id
assay_tissue
target_headers: ASI
Des
SASI
ASCTY
CEI
ASTI
column_mappings: assay_id
ASI
description
Des
src_assay_id
SASI
assay_cell_type
ASCTY
cell_id
CEI
assay_tissue
ASTI
output: {"column_mappings": [["assay_id", "ASI"], ["description", "Des"], ["src_assay_id", "SASI"], ["assay_cell_type", "ASCTY"], ["cell_id", "CEI"], ["assay_tissue", "ASTI"], ["doc_id", null], ["assay_type", null], ["assay_test_type", null], ["assay_category", null], ["assay_organism", null], ["assay_tax_id", null], ["assay_strain", null], ["assay_subcellular_fraction", null]]}