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.
RANKED: The Rarest, Most Expensive Video Games In The World. Jun. Just because video games are fun doesn't mean they can't mean serious business. People are willing to pay a hefty price for nostalgia and one-of-a-kind releases, and thanks to retro gaming website RacketBoy, you now see just how much. From golden Nintendo cartridges to games that let you play as an 8-bit Moses crossing the Red Sea, we've tabulated the rarest and most expensive games of all time. Spoiler alert: People love rare Atari games.