---
title: "Get AaSequence by ID"
method: GET
path: "/api/v3/aa-sequence/{aa_sequence_id}"
tags: ["AA Sequence"]
---

# Get AaSequence by ID

`GET /api/v3/aa-sequence/{aa_sequence_id}`

## Request

- Base URL: `https://{tenant_name}.benchling.com`
- URL: `https://{tenant_name}.benchling.com/api/v3/aa-sequence/{aa_sequence_id}`
- Auth: HTTP bearer

Get a single AaSequence by ID.

## Path parameters

- `aa_sequence_id` string, required

## Query parameters

- `returning` string[]
- `omit` string[]

## Response `200`

OK

- AaSequence: Represents an amino acid sequence in Benchling's molecular biology platform. An AaSequence stores the one-letter amino acid code string along with annotations marking functional regions, domains, or other features of interest. `AaSequence`s can be registered in the Registry with a unique entityRegistryId, organized in folders, and linked via schema fields to other entities. Annotations (see `AaAnnotation`) mark functional regions such as signal peptides, binding domains, or engineered mutations. Parts (see `AaPart`) indicate regions matching other registered `AaSequence`s.
  - `__typename` string
  - `aliases` string[], nullable: Array of aliases
  - `aminoAcids` string: Amino acids of the AA sequence.
  - `annotations` string, uri: Annotations marking functional regions, domains, binding sites, post-translational modifications, or other features on the AA sequence.
  - `archiveReason` string, nullable
  - `archived` boolean
  - `createdAt` string, datetime, nullable: DateTime the AA sequence was created.
  - `customFields` CustomField[], nullable: Custom fields set on the AA sequence.
    - `__typename` string
    - `name` string, nullable
    - `value` string, nullable
  - `entityRegistryId` string, nullable: The registry-assigned identifier for this item (e.g. its registry ID shown in the UI), present only once the item has been registered. Null if the item is not registered.
  - `folder` FolderRef
    - `__typename` string
    - `id` string, api_id
  - `id` string: ID of the AA sequence.
  - `modifiedAt` string, datetime, nullable: DateTime the AA sequence was last modified.
  - `name` string: Name of the item.
  - `project` ProjectRef
    - `__typename` string
    - `id` string, api_id
  - `registrationOrigin` RegistrationOrigin: Captures the provenance of an entity's registration into the registry. The `originEntry` links to the `DocumentLike` (typically an entry or notebook) from which the entity was registered, providing traceability back to the original experimental context. The `registeredAt` timestamp records when the registration occurred. This information helps scientists understand where registered entities came from and when they were added to the registry.
    - `__typename` string
    - `originEntry` DocumentLikeRef
      - `__typename` string
      - `id` string, api_id
    - `registeredAt` string, datetime, nullable
  - `registry` RegistryRef
    - `__typename` string
    - `id` string, api_id
  - `schema` EntitySchemaRef
    - `__typename` string
    - `id` string, api_id
  - `typedSchema` AaSequenceSchemaRef
    - `__typename` string
    - `id` string, api_id
  - `authors` string, uri, nullable
  - `creator` PrincipalRef
    - `__typename` string
    - `id` string, api_id
  - `schemaFields` SchemaFieldValue[], nullable
    - `__typename` string
    - `fieldDefinition` SchemaFieldDefinitionRef
      - `__typename` string
      - `id` string, api_id
    - `id` string
    - `linkedEntityId` string, nullable
    - `value` union: Types of values that Benchling can interpret.
      - object: A type that represents a list of BenchlingValues, used for multi-value cells (e.g. alias columns).
        - `__typename` 'ArrayValue', required: Discriminator value: ArrayValue
        - `value` SingularBenchlingValue[]
          - union: A union of value types that can appear as elements within an ArrayValue. Identical to BenchlingValue but excludes ArrayValue to prevent nesting. Keep in sync with BenchlingValue.
            - object: A type that represents boolean values.
              - …
            - object: A type that represents datetime values.
              - …
            - object: A type that represents date values.
              - …
            - object: A type that represents decimal value as strings.
              - …
            - object: A type that represents integer values.
              - …
            - object: A type that represents JSON values.
              - …
            - object: A type that represents a list of links to other objects.
              - …
            - object: A type that represents links to other objects.
              - …
            - object: A type that represents text (string) values with an associated URL.
              - …
            - object: A type that represents text (string) values.
              - …
      - object: A type that represents boolean values.
        - `__typename` 'BooleanValue', required: Discriminator value: BooleanValue
        - `value` boolean: The boolean value.
      - object: A type that represents datetime values.
        - `__typename` 'DateTimeValue', required: Discriminator value: DateTimeValue
        - `value` string, datetime: The datetime value with UTC as the timezone.
      - object: A type that represents date values.
        - `__typename` 'DateValue', required: Discriminator value: DateValue
        - `value` string, date: The date value.
      - object: A type that represents decimal value as strings.
        - `__typename` 'DecimalValue', required: Discriminator value: DecimalValue
        - `numericValue` number, double, nullable: Deprecated. The float representation of the decimal value.
        - `value` string, nullable: The decimal value in a string representation
      - object: A type that represents integer values.
        - `__typename` 'IntegerValue', required: Discriminator value: IntegerValue
        - `value` integer: The integer value.
      - object: A type that represents JSON values.
        - `__typename` 'JsonValue', required: Discriminator value: JsonValue
        - `value` union: The JSON value.
          - object
          - string[]
          - string
          - number, double
          - boolean
      - object: A type that represents a list of links to other objects.
        - `__typename` 'ObjectLinkListValue', required: Discriminator value: ObjectLinkListValue
        - `value` LinkableDomainObject[]: The list of objects that this value links to. Inaccessible objects may be returned instead if the object is not found with the current permission set.
          - union: A union representing items that can be linked to. If you have a type that can be linked to, it can only be added once it's in beta.
            - object: AaSequence variant
              - …
            - object: Attachment variant
              - …
            - object: Box variant
              - …
            - object: Container variant
              - …
            - object: CustomEntity variant
              - …
            - object: DnaOligo variant
              - …
            - object: DnaSequence variant
              - …
            - object: DropdownOption variant
              - …
            - object: Entry variant
              - …
            - object: Inaccessible variant
              - …
            - object: Location variant
              - …
            - object: MatrixPlate variant
              - …
            - object: Mixture variant
              - …
            - object: Molecule variant
              - …
            - object: OligoConjugate variant
              - …
            - object: OligoDuplex variant
              - …
            - object: Protein variant
              - …
            - object: Result variant
              - …
            - object: RnaOligo variant
              - …
            - object: RnaSequence variant
              - …
            - object: Run variant
              - …
            - object: WellPlate variant
              - …
      - object: A type that represents links to other objects.
        - `__typename` 'ObjectLinkValue', required: Discriminator value: ObjectLinkValue
        - `value` union: A union representing items that can be linked to. If you have a type that can be linked to, it can only be added once it's in beta.
          - object: AaSequence variant
            - `__typename` 'AaSequence', required: Discriminator value: AaSequence
            - `id` string, api_id
          - object: Attachment variant
            - `__typename` 'Attachment', required: Discriminator value: Attachment
            - `id` string, api_id
          - object: Box variant
            - `__typename` 'Box', required: Discriminator value: Box
            - `id` string, api_id
          - object: Container variant
            - `__typename` 'Container', required: Discriminator value: Container
            - `id` string, api_id
          - object: CustomEntity variant
            - `__typename` 'CustomEntity', required: Discriminator value: CustomEntity
            - `id` string, api_id
          - object: DnaOligo variant
            - `__typename` 'DnaOligo', required: Discriminator value: DnaOligo
            - `id` string, api_id
          - object: DnaSequence variant
            - `__typename` 'DnaSequence', required: Discriminator value: DnaSequence
            - `id` string, api_id
          - object: DropdownOption variant
            - `__typename` 'DropdownOption', required: Discriminator value: DropdownOption
            - `id` string, api_id
          - object: Entry variant
            - `__typename` 'Entry', required: Discriminator value: Entry
            - `id` string, api_id
          - object: Inaccessible variant
            - `__typename` 'Inaccessible', required: Discriminator value: Inaccessible
            - `id` string, api_id
          - object: Location variant
            - `__typename` 'Location', required: Discriminator value: Location
            - `id` string, api_id
          - object: MatrixPlate variant
            - `__typename` 'MatrixPlate', required: Discriminator value: MatrixPlate
            - `id` string, api_id
          - object: Mixture variant
            - `__typename` 'Mixture', required: Discriminator value: Mixture
            - `id` string, api_id
          - object: Molecule variant
            - `__typename` 'Molecule', required: Discriminator value: Molecule
            - `id` string, api_id
          - object: OligoConjugate variant
            - `__typename` 'OligoConjugate', required: Discriminator value: OligoConjugate
            - `id` string, api_id
          - object: OligoDuplex variant
            - `__typename` 'OligoDuplex', required: Discriminator value: OligoDuplex
            - `id` string, api_id
          - object: Protein variant
            - `__typename` 'Protein', required: Discriminator value: Protein
            - `id` string, api_id
          - object: Result variant
            - `__typename` 'Result', required: Discriminator value: Result
            - `id` string, api_id
          - object: RnaOligo variant
            - `__typename` 'RnaOligo', required: Discriminator value: RnaOligo
            - `id` string, api_id
          - object: RnaSequence variant
            - `__typename` 'RnaSequence', required: Discriminator value: RnaSequence
            - `id` string, api_id
          - object: Run variant
            - `__typename` 'Run', required: Discriminator value: Run
            - `id` string, api_id
          - object: WellPlate variant
            - `__typename` 'WellPlate', required: Discriminator value: WellPlate
            - `id` string, api_id
      - object: A type that represents text (string) values with an associated URL.
        - `__typename` string, required
        - `url` string: The URL associated with the value. Please use `TextValue` if you don't want a URL.
        - `value` string: The text value. It may or may not be an empty string.
      - object: A type that represents text (string) values.
        - `__typename` string, required
        - `value` string: The text value. It may or may not be an empty string.

## Other responses

- `400`: Bad Request
- `403`: Forbidden
- `404`: Not Found
- `429`: Too Many Requests
- `500`: Internal Server Error

---

[API](https://skmtc.dev/benchling/apis/benchling-api.md) - [All operations](https://skmtc.dev/benchling/apis/benchling-api/llms.txt) - [OpenAPI document](https://skmtc.dev/benchling/apis/benchling-api/revisions/c9f087b98b8b?raw)
