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Nomenclature system for Vip proteins. The system consists of four ranks based on amino acid sequence identity (9). The primary, secondary, and tertiary ranks distinguish proteins with less than ∼45, 78, and 95% sequence identities, respectively. The quaternary rank distinguishes proteins sharing >95% sequence identity, which can be considered products of “allelic” forms of the same gene but can also have the same sequence that originated from different isolates.
