00293nam a2200109Ia 4500008004100000040001100041100002100052245004000073260004700113300001300160300001000173251112s9999||||xx |||||||||||||| ||und||  aCNCLSA  aWilliam H. Stein 4aThe Journal of Biological Chemistry  c1973bNational Institutes of HealthaU.S.A  aP. 1-382  bV. 51