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The complete nucleotide sequence of the large (L) protein gene of simian virus 5 (SV5) was determined from cDNA of the genomic RNA and mRNA, and found to be 6804 bases in length, exclusive of a poly(A) tract. The sequence contained an open reading frame of 6765 nucleotides encoding 2255 amino acids. Results of dot matrix comparisons of the L protein of SV5 with those of human parainfluenza type 3 virus and Sendai virus indicated that there are five conserved domains, and that each domain contains characteristic sequence(s). The L protein of SV5 was detected in purified virions using antiserum directed against an oligopeptide corresponding to the N-terminal region.