Sheep's stomachs would have been used for storing milk, and contain rennet, a digestive enzyme still used to split curds and whey.

These include the predifferentiated, protodifferentiated, and differentiated stages, which correspond to undetectable, low, and high levels of digestive enzyme activity, respectively.

They are able to eat almost any form of matter, thanks to a special digestive enzyme triggered by strong electromagnetic radiation.

The common bean and many others, including the soybean, also contain trypsin inhibitors which interfere with the action of the digestive enzyme trypsin.

In college, he was successful in researching the digestive enzyme about protease which could be the source of the melting.