five major proline-rich polypeptides were detected and one of these was shown to be the in vitro precursor of the major anionic macaque proline-rich protein ( mprp ) , which is the structural and functional counterpart of the major anionic proline-rich proteins in the parotid and submandibular secretions of man ( oppenheim , f.g. , offner , g.d. , and troxler , r.f . ( 1982 ) j. biol . chem . 257 , 9271-9282 ) .
C0033665
precursor
C0033684
proteins