In addition to polyprotein 1ab 1 , polyprotein 1a and the four genes coding for major structural proteins spike ( S ) , small envelope ( E ) , membrane ( M ) and nucleocapsid ( N ) , six to eight additional proteins have been predicted
that polyprotein 1ab , polyprotein 1a , S , M and N are proteins of viral origin
In addition to polyprotein 1ab 1 , polyprotein 1a and the four genes coding for major structural proteins spike ( S ) , small envelope ( E ) , membrane ( M ) and nucleocapsid ( N ) , six to eight additional proteins have been predicted depending upon the strain analyzed .
Our method also suggests that polyprotein 1ab , polyprotein 1a , S , M and N are proteins of viral origin and others are of prokaryotic .