Causes chief cells to secrete pepsinogen, the zymogen (inactive) form of the digestive enzyme pepsin.

The lowering acid level itself can make symptoms similar to gastroesophageal reflux disease, and hinders protein digestion by holding back the enzyme pepsin.

Theodore Schwann (7 December 1810 - 11 January 1882) was a German scientist who isolated and named the enzyme pepsin.

The enzyme pepsin cleaves the F(ab') fragment off the antibody.

In 1929, Northrop isolated and crystallized the gastric enzyme pepsin and determined that it was a protein.

Pepsinogen is activated into the digestive enzyme pepsin when it comes in contact with acid produced by gastric parietal cells.

The stomach also produces the enzyme pepsin, which breaks down proteins (mostly found in meat, fish, eggs and dairy products).

In the stomach, assorted acids and the enzyme pepsin break down food.

The low pH also activates the enzyme precursor pepsinogen into the active enzyme pepsin by self-cleavage.

It was later named Pepsi Cola, possibly due to the digestive enzyme pepsin and kola nuts used in the recipe.