Many are structural, forming the viral envelope and capsid. However, there are also viral nonstructural proteins and viral regulatory and accessory proteins.
More than 490 have been identified.
Aggregated, these proteins can form inclusion bodies.
Recently a database named Viral Protein Structural Database (VPDB) has been published which summarises ~1,670 viral protein structures from >277 viruses with more than 465 virus strains. This database is freely available at the following URL http://vpdb.bicpu.edu.in.
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