the same number of sh groups reduces ferricyanide in surface films of egg albumin as in albumin denatured by urea , guanidine hydrochloride , duponol , or heat , provided the ferricyanide reacts with films while they still are at the surface and with the denatured proteins while the denaturing agent ( urea , heat , etc . ) is present .
C0001924
albumin
C0033684
proteins