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Reovirus viral attachment protein sigma 1 This family consists of the reovirus sigma 1 hemagglutinin, cell attachment protein. This glycoprotein is a minor capsid protein and also determines the serotype-specific humoral immune response. Sigma 1 consist of a fibrous tail and a globular head. The head has important roles in the cell attachment function of sigma 1 and determinant of the type-specific humoral immune response. Reovirus is part of the orthoreovirus group of retroviruses with, a dsRNA genome. Also present in this family is bacteriophage SF6 Lysozyme.
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Jiyao W et al.(2023). "The conserved domain database in 2023.",