> ## Documentation Index
> Fetch the complete documentation index at: https://instance.bio/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# dim_samples

The table that contains information about all physical samples processed in the assay. Each sample represents a distinct reaction vessel containing a specific candidate library exposed to a defined antigen concentration and biochemical condition. Other tables reference this table using sample identifiers (such as `sample_id`, `binding_sample_id`, or `expression_sample_id`) to look up assay parameters and experimental conditions.

**Grain:** one row per `sample_id`.

| Column | Type | Description |
| :- | :- | :- |
| `sample_id` | `string` | Uniquely identifies a physical sample in the run. Other tables reference this value to indicate which sample a record came from. |
| `sample_plan_id` | `string` | Identifies this sample specification established during the Planning stage, before experimental execution. |
| `candidate_library_id` | `string` | Identifies the pooled candidate library that was expressed and tested. |
| `candidate_library_plan_id` | `string` | Identifies this candidate library specification established during the Planning stage, before experimental execution. |
| `sino_catalog_id` | `string` | Identifies the antigen using its Sino Biological catalog number. Empty for samples that were not run against an antigen. |
| `antigen_concentration_nM` | `float` | Concentration of the antigen used in this sample, in nanomolar (nM). |
| `antigen_gene_name` | `string` | Gene name of the antigen. |
| `antigen_sequence` | `string` | Amino acid sequence of the antigen. |
| `translation_condition` | `string` | Describes the biochemical redox environment applied during in vitro translation, such as reducing or disulfide conditions, to facilitate proper candidate folding. |
| `selection` | `boolean` | Indicates whether the sample underwent antigen binding selection. `true` marks a binding sample exposed to an antigen; `false` marks a baseline expression sample. |


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