Hn1ab

Hn1ab is a term that lacks a widely accepted definition in germline genetics or virology. In databases and literature, it does not correspond to a canonical gene, protein, or locus. It may represent a typographical error, an abbreviation used in a limited context, or a composite made from other nomenclatural elements such as HN1 or AB. In influenza virus nomenclature, H and N denote hemagglutinin and neuraminidase; however, standard subtype names use H followed by a number and N followed by a number (for example H1N1). The string "Hn1ab" does not align with this convention and is not recognized as an official subtype. If Hn1ab appears in a document, its meaning should be clarified by the author or through accompanying metadata.

Possible interpretations include:

- A misprint for H1N1 or for separate symbols HN1 and AB in a given dataset.

- A provisional name used by a small study or database to label a specific sequence or construct, pending formal naming.

In practice, readers should verify against authoritative resources such as NCBI Gene, UniProt, Ensembl, or ICTV taxonomy to determine the intended term.