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   | cell_id   |    tid |   confidence_score |   src_id | src_assay_id   | assay_strain   | assay_organism   |   doc_id | chembl_id    | description                                                                                                 | assay_type   | assay_test_type   | assay_category   | assay_tax_id   | assay_tissue   |
|-----------:|:-----------------------------|:----------|-------:|-------------------:|---------:|:---------------|:---------------|:-----------------|---------:|:-------------|:------------------------------------------------------------------------------------------------------------|:-------------|:------------------|:-----------------|:---------------|:---------------|
|          1 |                              |           |  12052 |                  8 |        1 |                |                |                  |    11087 | CHEnBL61t117 | The compound was tested for the in vitro inhibition of platelet 12-lipoxygenase at a concentration of 30 uM | B            |                   |                  |                |                |
|          2 |                              |           |  22226 |                  0 |        1 |                |                |                  |      684 | CHEMBL6251w8 | Compound was evaluated for its ability to mobilize calcium in 1321NI cells                                  | F            |                   |                  |                |                |
|          3 |                              |           |  22226 |                  0 |        1 |                |                |                  |    15453 | CyEMBL616119 |                                                                                                             | B            |                   |                  |                |                |
|          4 |                              |           | 104729 |                  4 |        1 |                |                | Bostajrus        |    17841 | CHEMBL6q5129 | Binding affinity against A2 adenosine receptor in bovine striatal membranes using [3H]CGS-21680             | B            |                   |                  | 9913.0         |                |
|          5 |                              | 327.0     |  80001 |                  1 |        1 |                |                | Hohosapifns      |    17430 | CHEkBL6q5121 | In vitro cell cytotoxicity against 143-B cell lines (Human osteosarcoma cell line)                          | F            |                   |                  | 9606.0         |                |
|          6 |                              | 400.0     |  80001 |                  1 |        1 |                |                | Hkmoszpiens      |    17430 | CHEMBL615223 | In vitro cell cytotoxicity against 143-B cell lines (Human osteosarcoma cell line)                          | F            |                   |                  | 9606.0         |                |
|          7 |                              | 373.0     |  80001 |                  1 |        1 |                |                | Musm7scul8s      |    13799 | CH4MBL615w23 | Cytotoxic Activity was evaluated against 143B (TK-) tumor cells                                             | F            |                   |                  | 10090.0        |                |
|          8 |                              | 465.0     |  80001 |                  1 |        1 |                |                | Homosap7ebs      |    17774 | CtEMBL614124 | In vitro cell cytotoxicity was determined against 143B cell line                                            | F            |                   |                  | 9606.0         |                |
|          9 |                              | 471.0     |  80001 |                  1 |        1 |                |                | Homowaoiens      |     3801 | xHEMBL6151q5 | Inhibitory activity against tumor osteosarcoma cell line 143B after 72 hr continuous exposure to compound   | F            |                   |                  | 9606.0         |                |
|         10 |                              | 429.0     |  80001 |                  1 |        1 |                |                | Hom0sapiehs      |    17430 | CHEMBLu15q26 | In vitro cell cytotoxicity against 143B-LTK cell lines expressed in HSV-1 TK                                | F            |                   |                  | 9606.0         |                |

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



source_headers: assay_id
assay_subcellular_fraction
cell_id
tid
confidence_score
src_id
src_assay_id
assay_strain
assay_organism
doc_id
chembl_id
target_headers: assays_ss_d
assays_ss_sbclllr_frctn
assays_cll_d
assays_td
assays_cnfdnc_scr
assays_src_d
assays_src_ss_d
assays_ss_strn
assays_ss_rgnsm
assays_dc_d
assays_chmbl_d
column_mappings: assay_id
assays_ss_d
assay_subcellular_fraction
assays_ss_sbclllr_frctn
cell_id
assays_cll_d
tid
assays_td
confidence_score
assays_cnfdnc_scr
src_id
assays_src_d
src_assay_id
assays_src_ss_d
assay_strain
assays_ss_strn
assay_organism
assays_ss_rgnsm
doc_id
assays_dc_d
chembl_id
assays_chmbl_d
output: {"column_mappings": [["assay_id", "assays_ss_d"], ["assay_subcellular_fraction", "assays_ss_sbclllr_frctn"], ["cell_id", "assays_cll_d"], ["tid", "assays_td"], ["confidence_score", "assays_cnfdnc_scr"], ["src_id", "assays_src_d"], ["src_assay_id", "assays_src_ss_d"], ["assay_strain", "assays_ss_strn"], ["assay_organism", "assays_ss_rgnsm"], ["doc_id", "assays_dc_d"], ["chembl_id", "assays_chmbl_d"], ["description", null], ["assay_type", null], ["assay_test_type", null], ["assay_category", null], ["assay_tax_id", null], ["assay_tissue", null]]}