NC00000111

NC00000111 is a fictitious accession identifier commonly cited in instructional materials and example datasets to illustrate how sequence records are referenced in nucleotide databases. It is not associated with a verified entry in major public databases.

In practice, similar identifiers appear in repositories such as RefSeq and GenBank, with prefixes hinting at the type of record. The exact interpretation of NC00000111 depends on the registry that hosts it; as a placeholder, it is used to demonstrate fields such as organism, sequence length, features, submitter, and version. This helps users understand the structure of accession records without relying on a real example.

Usage in tutorials often centers on showing how to perform queries, fetch metadata, and cross-reference with related identifiers (for example NM_ for transcripts or NP_ for proteins). The identifier serves to illustrate data retrieval workflows and API access, enabling learners to practice with realistic, but nondependent, record formats.

Limitations of NC00000111 stem from its fictional status: any results tied to it in educational materials are synthetic and should not be cited as observed data. When working with real data, researchers should verify records against official databases using the exact accession numbers provided by the relevant repository. See also: accession number, NCBI RefSeq, GenBank, Entrez, and the NC_ prefix conventions.