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

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



source_headers: assay_id
curated_by
assay_type
assay_strain
src_id
relationship_type
target_headers: assays_ss_d
assays_crtd_b
assays_ss_tp
assays_ss_strn
assays_src_d
assays_rltnshp_tp
column_mappings: assay_id
assays_ss_d
curated_by
assays_crtd_b
assay_type
assays_ss_tp
assay_strain
assays_ss_strn
src_id
assays_src_d
relationship_type
assays_rltnshp_tp
output: {"column_mappings": [["assay_id", "assays_ss_d"], ["curated_by", "assays_crtd_b"], ["assay_type", "assays_ss_tp"], ["assay_strain", "assays_ss_strn"], ["src_id", "assays_src_d"], ["relationship_type", "assays_rltnshp_tp"], ["doc_id", null], ["description", null], ["assay_test_type", null], ["assay_category", null], ["assay_organism", null], ["assay_tax_id", null], ["assay_tissue", null], ["assay_cell_type", null]]}