Pepsin 1:10000 is a proteolytic enzyme found in the digestive system. Non-specific background staining in bronchial tissue can be reduced after Pepsin 1:10000 digestion.
Pepsin digests 10,000 times it's weight of coagulated egg albumin.(1 pepsin unit will digest 10,000 units coagulated egg albumin at 52°C, PH 2-3, no time involved.)