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

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



source_headers: assay_id
tissue_id
assay_cell_type
assay_tissue
assay_organism
src_assay_id
assay_type
assay_subcellular_fraction
cell_id
relationship_type
doc_id
bao_format
chembl_id
tid
assay_category
curated_by
target_headers: assays_ss_d
assays_tss_d
assays_ss_cll_tp
assays_ss_tss
assays_ss_rgnsm
assays_src_ss_d
assays_ss_tp
assays_ss_sbclllr_frctn
assays_cll_d
assays_rltnshp_tp
assays_dc_d
assays_b_frmt
assays_chmbl_d
assays_td
assays_ss_ctgr
assays_crtd_b
column_mappings: assay_id
assays_ss_d
tissue_id
assays_tss_d
assay_cell_type
assays_ss_cll_tp
assay_tissue
assays_ss_tss
assay_organism
assays_ss_rgnsm
src_assay_id
assays_src_ss_d
assay_type
assays_ss_tp
assay_subcellular_fraction
assays_ss_sbclllr_frctn
cell_id
assays_cll_d
relationship_type
assays_rltnshp_tp
doc_id
assays_dc_d
bao_format
assays_b_frmt
chembl_id
assays_chmbl_d
tid
assays_td
assay_category
assays_ss_ctgr
curated_by
assays_crtd_b
output: {"column_mappings": [["assay_id", "assays_ss_d"], ["tissue_id", "assays_tss_d"], ["assay_cell_type", "assays_ss_cll_tp"], ["assay_tissue", "assays_ss_tss"], ["assay_organism", "assays_ss_rgnsm"], ["src_assay_id", "assays_src_ss_d"], ["assay_type", "assays_ss_tp"], ["assay_subcellular_fraction", "assays_ss_sbclllr_frctn"], ["cell_id", "assays_cll_d"], ["relationship_type", "assays_rltnshp_tp"], ["doc_id", "assays_dc_d"], ["bao_format", "assays_b_frmt"], ["chembl_id", "assays_chmbl_d"], ["tid", "assays_td"], ["assay_category", "assays_ss_ctgr"], ["curated_by", "assays_crtd_b"], ["description", null], ["assay_test_type", null], ["assay_tax_id", null]]}