from our studies of the polypeptides of the human herpesviruses and of a broad collection of human and other viral protein sequences , distinctive charge configurations appear to be associated with viral capsid and core proteins ( positive clusters or runs , mostly at the carboxyl terminus ) , with many viral glycoproteins and membrane-associated proteins ( negative charge clusters ) , and with transactivators and transforming proteins ( multiple charge structures ) .
C0042736
viral protein
C0033684
proteins