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

TableB:
|   assays_ss_d | assays_tss_d   |   assays_src_d | assays_ss_tss   |   assays_dc_d | assays_ss_sbclllr_frctn   |   assays_td | assays_rltnshp_tp   |   assays_cnfdnc_scr | assays_crtd_b   | assays_src_ss_d   | assays_chmbl_d   | assays_cll_d   | assays_b_frmt   | assays_vrnt_d   |
|--------------:|:---------------|---------------:|:----------------|--------------:|:--------------------------|------------:|:--------------------|--------------------:|:----------------|:------------------|:-----------------|:---------------|:----------------|:----------------|
|          7524 | 2113.0         |              1 | Kidney          |          9866 |                           |       50597 | N                   |                   1 | Intermediate    |                   | CHEMBL618647     |                | BAO_0000218     |                 |
|          7525 | 2113.0         |              1 | Kidney          |          9866 |                           |       50597 | N                   |                   1 | Intermediate    |                   | CHEMBL618648     |                | BAO_0000218     |                 |
|          7526 | 2113.0         |              1 | Kidney          |          9866 |                           |       50597 | N                   |                   1 | Intermediate    |                   | CHEMBL618649     |                | BAO_0000218     |                 |
|          7527 | 2107.0         |              1 | Liver           |          9866 |                           |       50597 | N                   |                   1 | Intermediate    |                   | CHEMBL618650     |                | BAO_0000218     |                 |
|          7528 | 2107.0         |              1 | Liver           |          9866 |                           |       50597 | N                   |                   1 | Intermediate    |                   | CHEMBL618651     |                | BAO_0000218     |                 |
|          7529 | 2107.0         |              1 | Liver           |          9866 |                           |       50597 | N                   |                   1 | Intermediate    |                   | CHEMBL876497     |                | BAO_0000218     |                 |
|          7530 | 2048.0         |              1 | Lung            |          9866 |                           |       50597 | N                   |                   1 | Intermediate    |                   | CHEMBL618652     |                | BAO_0000218     |                 |
|          7531 | 2048.0         |              1 | Lung            |          9866 |                           |       50597 | N                   |                   1 | Intermediate    |                   | CHEMBL618653     |                | BAO_0000218     |                 |
|          7532 | 2048.0         |              1 | Lung            |          9866 |                           |       50597 | N                   |                   1 | Intermediate    |                   | CHEMBL618654     |                | BAO_0000218     |                 |
|          7533 |                |              1 |                 |          6351 |                           |       50597 | N                   |                   1 | Intermediate    |                   | CHEMBL618655     |                | BAO_0000218     |                 |



source_headers: assay_id
tissue_id
src_id
assay_tissue
doc_id
assay_subcellular_fraction
target_headers: assays_ss_d
assays_tss_d
assays_src_d
assays_ss_tss
assays_dc_d
assays_ss_sbclllr_frctn
column_mappings: assay_id
assays_ss_d
tissue_id
assays_tss_d
src_id
assays_src_d
assay_tissue
assays_ss_tss
doc_id
assays_dc_d
assay_subcellular_fraction
assays_ss_sbclllr_frctn
output: {"column_mappings": [["assay_id", "assays_ss_d"], ["tissue_id", "assays_tss_d"], ["src_id", "assays_src_d"], ["assay_tissue", "assays_ss_tss"], ["doc_id", "assays_dc_d"], ["assay_subcellular_fraction", "assays_ss_sbclllr_frctn"], ["description", 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]]}