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 |   doc_id | description                                                                                                 | assay_type   | assay_test_type   | assay_category   | assay_organism   | assay_tax_id   | assay_strain   | assay_tissue   | assay_cell_type   | assay_subcellular_fraction   |    tid | relationship_type   |   confidence_score | curated_by   |   src_id | src_assay_id   | chembl_id    | cell_id   | bao_format   | tissue_id   | variant_id   |
|-----------:|---------:|:------------------------------------------------------------------------------------------------------------|:-------------|:------------------|:-----------------|:-----------------|:---------------|:---------------|:---------------|:------------------|:-----------------------------|-------:|:--------------------|-------------------:|:-------------|---------:|:---------------|:-------------|:----------|:-------------|:------------|:-------------|
|          1 |    11087 | The compound was tested for the in vitro inhibition of platelet 12-lipoxygenase at a concentration of 30 uM | B            |                   |                  |                  |                |                |                |                   |                              |  12052 | H                   |                  8 | Autocuration |        1 |                | CHEMBL615117 |           | BAO_0000019  |             |              |
|          2 |      684 | Compound was evaluated for its ability to mobilize calcium in 1321NI cells                                  | F            |                   |                  |                  |                |                |                |                   |                              |  22226 | U                   |                  0 | Autocuration |        1 |                | CHEMBL615118 |           | BAO_0000219  |             |              |
|          3 |    15453 |                                                                                                             | B            |                   |                  |                  |                |                |                |                   |                              |  22226 | U                   |                  0 | Autocuration |        1 |                | CHEMBL615119 |           | BAO_0000019  |             |              |
|          4 |    17841 | Binding affinity against A2 adenosine receptor in bovine striatal membranes using [3H]CGS-21680             | B            |                   |                  | Bos taurus       | 9913.0         |                |                |                   |                              | 104729 | H                   |                  4 | Autocuration |        1 |                | CHEMBL615120 |           | BAO_0000249  |             |              |
|          5 |    17430 | In vitro cell cytotoxicity against 143-B cell lines (Human osteosarcoma cell line)                          | F            |                   |                  | Homo sapiens     | 9606.0         |                |                | 143B              |                              |  80001 | N                   |                  1 | Intermediate |        1 |                | CHEMBL615121 | 163.0     | BAO_0000219  |             |              |
|          6 |    17430 | In vitro cell cytotoxicity against 143-B cell lines (Human osteosarcoma cell line)                          | F            |                   |                  | Homo sapiens     | 9606.0         |                |                | 143B              |                              |  80001 | N                   |                  1 | Intermediate |        1 |                | CHEMBL615122 | 163.0     | BAO_0000219  |             |              |
|          7 |    13799 | Cytotoxic Activity was evaluated against 143B (TK-) tumor cells                                             | F            |                   |                  | Mus musculus     | 10090.0        |                |                | 143B              |                              |  80001 | N                   |                  1 | Intermediate |        1 |                | CHEMBL615123 | 163.0     | BAO_0000219  |             |              |
|          8 |    17774 | In vitro cell cytotoxicity was determined against 143B cell line                                            | F            |                   |                  | Homo sapiens     | 9606.0         |                |                | 143B              |                              |  80001 | N                   |                  1 | Expert       |        1 |                | CHEMBL615124 | 163.0     | BAO_0000219  |             |              |
|          9 |     3801 | Inhibitory activity against tumor osteosarcoma cell line 143B after 72 hr continuous exposure to compound   | F            |                   |                  | Homo sapiens     | 9606.0         |                |                | 143B              |                              |  80001 | N                   |                  1 | Intermediate |        1 |                | CHEMBL615125 | 163.0     | BAO_0000219  |             |              |
|         10 |    17430 | In vitro cell cytotoxicity against 143B-LTK cell lines expressed in HSV-1 TK                                | F            |                   |                  | Homo sapiens     | 9606.0         |                |                | 143B              |                              |  80001 | N                   |                  1 | Intermediate |        1 |                | CHEMBL615126 | 163.0     | BAO_0000219  |             |              |

TableB:
|   ss_d |   dc_d | dscrptn                                                                                                  | ss_tp   | ss_tst_tp   | ss_ctgr   | ss_rgnsm          |   ss_tx_d | ss_strn   | ss_tss   | ss_cll_tp   | ss_sbclllr_frctn   |    td | rltnshp_tp   |   cnfdnc_scr | crtd_b       |   src_d | src_ss_d   | chmbl_d      | cll_d   | b_frmt      | tss_d   | vrnt_d   |
|-------:|-------:|:---------------------------------------------------------------------------------------------------------|:--------|:------------|:----------|:------------------|----------:|:----------|:---------|:------------|:-------------------|------:|:-------------|-------------:|:-------------|--------:|:-----------|:-------------|:--------|:------------|:--------|:---------|
|   7524 |   9866 | Biodistribution in normal rat kidney in the presence of 0.005 M Gd/0.01 M lig at 2 hr                    | A       | In vivo     |           | Rattus norvegicus |     10116 |           | Kidney   |             |                    | 50597 | N            |            1 | Intermediate |       1 |            | CHEMBL618647 |         | BAO_0000218 | 2113.0  |          |
|   7525 |   9866 | Biodistribution in normal rat kidney in the presence of 0.01 M Gd/0.05 M lig                             | A       | In vivo     |           | Rattus norvegicus |     10116 |           | Kidney   |             |                    | 50597 | N            |            1 | Intermediate |       1 |            | CHEMBL618648 |         | BAO_0000218 | 2113.0  |          |
|   7526 |   9866 | Biodistribution in normal rat kidney in the presence of NAC Gd 0.01 M lig at 2 hr                        | A       | In vivo     |           | Rattus norvegicus |     10116 |           | Kidney   |             |                    | 50597 | N            |            1 | Intermediate |       1 |            | CHEMBL618649 |         | BAO_0000218 | 2113.0  |          |
|   7527 |   9866 | Biodistribution in normal rat liver in the presence of 0.005 M Gd/0.01 M lig at 2 hr                     | A       | In vivo     |           | Rattus norvegicus |     10116 |           | Liver    |             |                    | 50597 | N            |            1 | Intermediate |       1 |            | CHEMBL618650 |         | BAO_0000218 | 2107.0  |          |
|   7528 |   9866 | Biodistribution in normal rat liver in the presence of 0.01 M Gd/0.05 M lig                              | A       | In vivo     |           | Rattus norvegicus |     10116 |           | Liver    |             |                    | 50597 | N            |            1 | Intermediate |       1 |            | CHEMBL618651 |         | BAO_0000218 | 2107.0  |          |
|   7529 |   9866 | Biodistribution in normal rat liver in the presence of NAC Gd 0.01 M lig at 2 hr                         | A       | In vivo     |           | Rattus norvegicus |     10116 |           | Liver    |             |                    | 50597 | N            |            1 | Intermediate |       1 |            | CHEMBL876497 |         | BAO_0000218 | 2107.0  |          |
|   7530 |   9866 | Biodistribution in normal rat lung in the presence of 0.005 M Gd/0.01 M lig at 2 hr                      | A       | In vivo     |           | Rattus norvegicus |     10116 |           | Lung     |             |                    | 50597 | N            |            1 | Intermediate |       1 |            | CHEMBL618652 |         | BAO_0000218 | 2048.0  |          |
|   7531 |   9866 | Biodistribution in normal rat lung in the presence of 0.01 M Gd/0.05 M lig                               | A       | In vivo     |           | Rattus norvegicus |     10116 |           | Lung     |             |                    | 50597 | N            |            1 | Intermediate |       1 |            | CHEMBL618653 |         | BAO_0000218 | 2048.0  |          |
|   7532 |   9866 | Biodistribution in normal rat lung in the presence of NAC Gd 0.01 M lig at 2 hr                          | A       | In vivo     |           | Rattus norvegicus |     10116 |           | Lung     |             |                    | 50597 | N            |            1 | Intermediate |       1 |            | CHEMBL618654 |         | BAO_0000218 | 2048.0  |          |
|   7533 |   6351 | Recovery rate from urine and bile was determined after iv administration at 20 mg/kg in rats; Not tested | A       |             |           | Rattus norvegicus |     10116 |           |          |             |                    | 50597 | N            |            1 | Intermediate |       1 |            | CHEMBL618655 |         | BAO_0000218 |         |          |



source_headers: assay_id
doc_id
description
assay_type
assay_test_type
assay_category
assay_organism
assay_tax_id
assay_strain
assay_tissue
assay_cell_type
assay_subcellular_fraction
tid
relationship_type
confidence_score
curated_by
src_id
src_assay_id
chembl_id
cell_id
bao_format
tissue_id
variant_id
target_headers: ss_d
dc_d
dscrptn
ss_tp
ss_tst_tp
ss_ctgr
ss_rgnsm
ss_tx_d
ss_strn
ss_tss
ss_cll_tp
ss_sbclllr_frctn
td
rltnshp_tp
cnfdnc_scr
crtd_b
src_d
src_ss_d
chmbl_d
cll_d
b_frmt
tss_d
vrnt_d
column_mappings: assay_id
ss_d
doc_id
dc_d
description
dscrptn
assay_type
ss_tp
assay_test_type
ss_tst_tp
assay_category
ss_ctgr
assay_organism
ss_rgnsm
assay_tax_id
ss_tx_d
assay_strain
ss_strn
assay_tissue
ss_tss
assay_cell_type
ss_cll_tp
assay_subcellular_fraction
ss_sbclllr_frctn
tid
td
relationship_type
rltnshp_tp
confidence_score
cnfdnc_scr
curated_by
crtd_b
src_id
src_d
src_assay_id
src_ss_d
chembl_id
chmbl_d
cell_id
cll_d
bao_format
b_frmt
tissue_id
tss_d
variant_id
vrnt_d
output: {"column_mappings": [["assay_id", "ss_d"], ["doc_id", "dc_d"], ["description", "dscrptn"], ["assay_type", "ss_tp"], ["assay_test_type", "ss_tst_tp"], ["assay_category", "ss_ctgr"], ["assay_organism", "ss_rgnsm"], ["assay_tax_id", "ss_tx_d"], ["assay_strain", "ss_strn"], ["assay_tissue", "ss_tss"], ["assay_cell_type", "ss_cll_tp"], ["assay_subcellular_fraction", "ss_sbclllr_frctn"], ["tid", "td"], ["relationship_type", "rltnshp_tp"], ["confidence_score", "cnfdnc_scr"], ["curated_by", "crtd_b"], ["src_id", "src_d"], ["src_assay_id", "src_ss_d"], ["chembl_id", "chmbl_d"], ["cell_id", "cll_d"], ["bao_format", "b_frmt"], ["tissue_id", "tss_d"], ["variant_id", "vrnt_d"]]}