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

TableB:
|   assays_ss_d | assays_ss_sbclllr_frctn   | assays_ss_strn   | assays_ss_tst_tp   | assays_ss_tx_d   | assays_tss_d   | assays_src_ss_d   | assays_vrnt_d   |   assays_td | assays_ss_ctgr   |   assays_src_d | assays_rltnshp_tp   |   assays_cnfdnc_scr | assays_crtd_b   | assays_chmbl_d   | assays_cll_d   | assays_b_frmt   |
|--------------:|:--------------------------|:-----------------|:-------------------|:-----------------|:---------------|:------------------|:----------------|------------:|:-----------------|---------------:|:--------------------|--------------------:|:----------------|:-----------------|:---------------|:----------------|
|             1 |                           |                  |                    |                  |                |                   |                 |       12052 |                  |              1 | H                   |                   8 | Autocuration    | CHEMBL615117     |                | BAO_0000019     |
|             2 |                           |                  |                    |                  |                |                   |                 |       22226 |                  |              1 | U                   |                   0 | Autocuration    | CHEMBL615118     |                | BAO_0000219     |
|             3 |                           |                  |                    |                  |                |                   |                 |       22226 |                  |              1 | U                   |                   0 | Autocuration    | CHEMBL615119     |                | BAO_0000019     |
|             4 |                           |                  |                    | 9913.0           |                |                   |                 |      104729 |                  |              1 | H                   |                   4 | Autocuration    | CHEMBL615120     |                | BAO_0000249     |
|             5 |                           |                  |                    | 9606.0           |                |                   |                 |       80001 |                  |              1 | N                   |                   1 | Intermediate    | CHEMBL615121     | 163.0          | BAO_0000219     |
|             6 |                           |                  |                    | 9606.0           |                |                   |                 |       80001 |                  |              1 | N                   |                   1 | Intermediate    | CHEMBL615122     | 163.0          | BAO_0000219     |
|             7 |                           |                  |                    | 10090.0          |                |                   |                 |       80001 |                  |              1 | N                   |                   1 | Intermediate    | CHEMBL615123     | 163.0          | BAO_0000219     |
|             8 |                           |                  |                    | 9606.0           |                |                   |                 |       80001 |                  |              1 | N                   |                   1 | Expert          | CHEMBL615124     | 163.0          | BAO_0000219     |
|             9 |                           |                  |                    | 9606.0           |                |                   |                 |       80001 |                  |              1 | N                   |                   1 | Intermediate    | CHEMBL615125     | 163.0          | BAO_0000219     |
|            10 |                           |                  |                    | 9606.0           |                |                   |                 |       80001 |                  |              1 | N                   |                   1 | Intermediate    | CHEMBL615126     | 163.0          | BAO_0000219     |



source_headers: assay_id
assay_subcellular_fraction
assay_strain
assay_test_type
assay_tax_id
tissue_id
src_assay_id
variant_id
tid
assay_category
src_id
target_headers: assays_ss_d
assays_ss_sbclllr_frctn
assays_ss_strn
assays_ss_tst_tp
assays_ss_tx_d
assays_tss_d
assays_src_ss_d
assays_vrnt_d
assays_td
assays_ss_ctgr
assays_src_d
column_mappings: assay_id
assays_ss_d
assay_subcellular_fraction
assays_ss_sbclllr_frctn
assay_strain
assays_ss_strn
assay_test_type
assays_ss_tst_tp
assay_tax_id
assays_ss_tx_d
tissue_id
assays_tss_d
src_assay_id
assays_src_ss_d
variant_id
assays_vrnt_d
tid
assays_td
assay_category
assays_ss_ctgr
src_id
assays_src_d
output: {"column_mappings": [["assay_id", "assays_ss_d"], ["assay_subcellular_fraction", "assays_ss_sbclllr_frctn"], ["assay_strain", "assays_ss_strn"], ["assay_test_type", "assays_ss_tst_tp"], ["assay_tax_id", "assays_ss_tx_d"], ["tissue_id", "assays_tss_d"], ["src_assay_id", "assays_src_ss_d"], ["variant_id", "assays_vrnt_d"], ["tid", "assays_td"], ["assay_category", "assays_ss_ctgr"], ["src_id", "assays_src_d"], ["doc_id", null], ["description", null], ["assay_type", null], ["assay_organism", null], ["assay_tissue", null], ["assay_cell_type", null]]}