1.   Addition of this phosphate group impairs the function of the essential protein, and viral protein synthesis fails to begin.

2.   But exactly how viral protein synthesis is selectively inhibited, leaving cellular protein synthesis relatively unaffected, is still not clear.

3.   During these final stages host enzymes attach carbohydrate groups to certain viral proteins, converting them into glycoproteins.

4.   One of the three drugs they received was ritonavir, an inhibitor of the enzyme protease, which processes key viral proteins.

5.   For example, for bluetongue virus seven viral proteins are incorporated into virions.

6.   Although most ERVs do not normally produce the viral proteins that provoke attack from the host immune system, many retain the genetic code for such particles.

7.   Cells picked up the DNA and used those viral genes to make viral proteins.

8.   He said people had been eating infected fruits containing the viral protein for years with no ill effect.

9.   Scientists also hope to target viral regulatory proteins that accelerate or slow the spread of the virus.