A total preparation of cytoplasmic RNA was isolated from late stage-infected African green monkey kidney cells using phenol extraction procedure. The poly (A)-containing mRNA fraction was selected on oligo(dT)-cellulose columns. The resulting mRNA preparations were heterogenous in size and contained about 20--60% of SA7-derived sequences. SA7 late mRNA was efficiently translated in rabbit reticulocyte cell-free system giving rise to a number of polypeptide products that were related by antigenicity to authentic SA7 virion proteins. The main translation product having a molecular weight of 114 kilodaltons was identified as intact SA7 hexon protein.
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