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 genes 

""It encodes just four genes: the maturation protein (A-protein), the lysis protein, and the replicase protein."" That's the maturation protein (A-protein), the coat protein, the lysis protein, and the replicase protein.
It would probably be worth mentioning that the replicase enzyme consists of the replicase protein plus 3 E. coli proteins, ribosomal protein S1, elongation factor Tu, & elongation factor Ts.
69.72.27.161  "