Once a Hawaiian Punch guy...always a Hawaiian Punch guy...in this week's edition of Clint Walker's award-winning THROWBACK ...

This depends on the type of enzyme. The enzyme pepsin breaks down proteins in the acidic conditions of the stomach. Pepsin has an optimum of pH 2.5 and a working range of between pH 1-4.

2 Epithelial Biology Center, Vanderbilt University School of Medicine, Nashville, Tennessee, USA Correspondence to Dr J R Goldenring, Section of Surgical Sciences, Vanderbilt University School of ...