Rangarira ndima iri pasi apa uye ipapo pindura mubvunzo gare gare mumutauro mumwe chetewo sechikamu:  William Howard Stein (June 25, 1911 <unk> February 2, 1980) akanga ari muAmerican biochemist.  Mubvunzo: William Howard Stein akafa rini?
February 2, 1980