Tail virion protein 7P is a viral transmembrane protein that interacts with the packaging signal of the viral genome leading to the initiation the virion concomitant assembly-budding process in the host inner membrane.

1: Genes VI, VII, and IX of phage M13 code for minor capsid proteins of the virion. Simons GF, Konings RN, Schoenmakers JG; Proc Natl Acad Sci U S A. 1981;78:4194-4198. PMID:6945579