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The Avi tag is a 15 amino acid peptide tag with the sequence Gly-Leu-Asn-Asp-Ile-Phe-Glu-Ala-Gln-Lys-Ile-Glu-Trp-His-Glu. It is a popular fusion tag with powerful and versatile properties. Fused to the protein, the Avi tag provides a multi-functional system useful for many applications, including:

Expression
Imaging
Detection
Localization
Isolation
Immobilization

https://www.creativebiomart.net/avi-tag-biotinylated-proteins.htm