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

TableB:
|   assays_ss_d |   assays_cnfdnc_scr | assays_vrnt_d   | assays_ss_ctgr   | assays_tss_d   | assays_ss_sbclllr_frctn   | assays_ss_tst_tp   | assays_ss_rgnsm   | assays_src_ss_d   |   assays_src_d | assays_rltnshp_tp   | assays_ss_cll_tp   |   assays_td | assays_crtd_b   | assays_chmbl_d   | assays_cll_d   | assays_b_frmt   |
|--------------:|--------------------:|:----------------|:-----------------|:---------------|:--------------------------|:-------------------|:------------------|:------------------|---------------:|:--------------------|:-------------------|------------:|:----------------|:-----------------|:---------------|:----------------|
|          7524 |                   1 |                 |                  | 2113.0         |                           | In vivo            | Rattus norvegicus |                   |              1 | N                   |                    |       50597 | Intermediate    | CHEMBL618647     |                | BAO_0000218     |
|          7525 |                   1 |                 |                  | 2113.0         |                           | In vivo            | Rattus norvegicus |                   |              1 | N                   |                    |       50597 | Intermediate    | CHEMBL618648     |                | BAO_0000218     |
|          7526 |                   1 |                 |                  | 2113.0         |                           | In vivo            | Rattus norvegicus |                   |              1 | N                   |                    |       50597 | Intermediate    | CHEMBL618649     |                | BAO_0000218     |
|          7527 |                   1 |                 |                  | 2107.0         |                           | In vivo            | Rattus norvegicus |                   |              1 | N                   |                    |       50597 | Intermediate    | CHEMBL618650     |                | BAO_0000218     |
|          7528 |                   1 |                 |                  | 2107.0         |                           | In vivo            | Rattus norvegicus |                   |              1 | N                   |                    |       50597 | Intermediate    | CHEMBL618651     |                | BAO_0000218     |
|          7529 |                   1 |                 |                  | 2107.0         |                           | In vivo            | Rattus norvegicus |                   |              1 | N                   |                    |       50597 | Intermediate    | CHEMBL876497     |                | BAO_0000218     |
|          7530 |                   1 |                 |                  | 2048.0         |                           | In vivo            | Rattus norvegicus |                   |              1 | N                   |                    |       50597 | Intermediate    | CHEMBL618652     |                | BAO_0000218     |
|          7531 |                   1 |                 |                  | 2048.0         |                           | In vivo            | Rattus norvegicus |                   |              1 | N                   |                    |       50597 | Intermediate    | CHEMBL618653     |                | BAO_0000218     |
|          7532 |                   1 |                 |                  | 2048.0         |                           | In vivo            | Rattus norvegicus |                   |              1 | N                   |                    |       50597 | Intermediate    | CHEMBL618654     |                | BAO_0000218     |
|          7533 |                   1 |                 |                  |                |                           |                    | Rattus norvegicus |                   |              1 | N                   |                    |       50597 | Intermediate    | CHEMBL618655     |                | BAO_0000218     |



source_headers: assay_id
confidence_score
variant_id
assay_category
tissue_id
assay_subcellular_fraction
assay_test_type
assay_organism
src_assay_id
src_id
relationship_type
target_headers: assays_ss_d
assays_cnfdnc_scr
assays_vrnt_d
assays_ss_ctgr
assays_tss_d
assays_ss_sbclllr_frctn
assays_ss_tst_tp
assays_ss_rgnsm
assays_src_ss_d
assays_src_d
assays_rltnshp_tp
column_mappings: assay_id
assays_ss_d
confidence_score
assays_cnfdnc_scr
variant_id
assays_vrnt_d
assay_category
assays_ss_ctgr
tissue_id
assays_tss_d
assay_subcellular_fraction
assays_ss_sbclllr_frctn
assay_test_type
assays_ss_tst_tp
assay_organism
assays_ss_rgnsm
src_assay_id
assays_src_ss_d
src_id
assays_src_d
relationship_type
assays_rltnshp_tp
output: {"column_mappings": [["assay_id", "assays_ss_d"], ["confidence_score", "assays_cnfdnc_scr"], ["variant_id", "assays_vrnt_d"], ["assay_category", "assays_ss_ctgr"], ["tissue_id", "assays_tss_d"], ["assay_subcellular_fraction", "assays_ss_sbclllr_frctn"], ["assay_test_type", "assays_ss_tst_tp"], ["assay_organism", "assays_ss_rgnsm"], ["src_assay_id", "assays_src_ss_d"], ["src_id", "assays_src_d"], ["relationship_type", "assays_rltnshp_tp"], ["doc_id", null], ["description", null], ["assay_type", null], ["assay_tax_id", null], ["assay_strain", null], ["assay_tissue", null]]}