Mutants of the autonomous parvovirus minute virus of mice (MVM) strains MVM(p) and MVM(i) that either fail to produce or produce a truncated NS2 protein, were deficient in the production of infectious virus and attained lower levels of viral DNA synthesis than wildtype virus following infection of a series of normal and transformed murine cell lines. Mutant virus growth and the levels of DNA replication were similar to those of wild-type virus in the rat, hamster and human lines tested. These results suggest that the requirement of NS2 for the growth of MVM is murine species-specific.


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