a working hypothesis is presented in which two species of cellular enzymes , signalase ( s ) removing signal sequences and enzymes involved in cleaving polyproteins after a pair of basic amino acids , do generate the proteins v2 , nv2 , and v1 from the growing peptide chain synthesized during translation of the 42 s genome rna which functions as mrna for these proteins .
C0032583
polyproteins
C0033684
proteins