1 Pepsin is the main gastric enzyme. 2  It is produced by the stomach cells called chief cells in its inactive form pepsinogen, which is a zymogen. 3  Pepsinogen is then activated by the stomach acid into its active form, pepsin.igestive enzymes are enzymes that break down polymeric macromolecules into their smaller building blocks, in order to facilitate their absorption by the body.
Search form. Trending. The 10 best arcade games of ALL TIME. If you were alive and had access to coins at any time between the 1970s and the mid-1990s, chances are you'll have spent a bit of time in a video arcade, hammering buttons, frantically waggling a sweaty joystick and pumping a week's worth of pocket money into Wonder Boy.
From silliness to hardcore gore, this list of the top 10 zombie games for PC is sure to supply hours of entertainment.  1 Left 4 Dead â The Left 4 Dead series is by far the most popular zombie PC collection, and for good reason.  Killing Floor â A top ten list of zombie PC games wouldn't be complete without this gem.