Viral regulatory and accessory protein
Encyclopedia
A viral regulatory and accessory protein is a type of viral protein
Viral protein
A viral protein is a protein generated by a virus.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....

 that can play an indirect role in the function of a virus.

An example is Nef
Nef (protein)
Nef is a protein expressed by primate lentiviruses. These include human immunodeficiency viruses and simian immunodeficiency virus . Nef is one of many pathogen-expressed proteins, known as virulence factors, which function to manipulate the host's cellular machinery and thus allow infection,...

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