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Amino acid sequences for the protease of PERV subtypes A/B and C. The Pol ORF sequences of PERV subtype A/B (DuxDL3791), PERV subtype C (MSL), and MMLV (MoMuLV) were compared in a multiple alignment. Identical residues in the putative protease common to all three sequences are boxed. The suppressed gag stop codon, TAG, is indicated by an X. Asterisks indicate amino acid differences between PERV proteases of subtypes A/B and C.
