Wiktionary
prosecretin
n. (context biochemistry English) A precursor to secretin, activated by gastric acid.
Usage examples of "prosecretin".
The prosecretin molecule requires, apparently, one small chemical change to become actual secretin.
It is logical to suppose that prosecretin is a comparatively large molecule, too large to get through the cell membrane and therefore safely immured within the cell.
The influx of acid from the stomach suffices to break the prosecretin molecule into smaller fragments, and these fragments secretin diffuse out into the bloodstream.
The prosecretin might be thought of as resembling a perforated block of stamps.