bvurd was directly phosphorylated in hsv-1-infected cells , presumably by the virus-encoded thymidine kinase ( tk ) , since ( i ) bvurd was not phosphorylated by extracts of cells infected with a hsv-1 strain deficient in tk expression and ( ii ) the phosphorylation was inhibited by a polyclonal anti-hsv-1 antibody .
C0040078
tk
C0031715
phosphorylation