Did some searching which I think?? Leads me to conclusion that it's a "negative" in the choir. Rennet contains enzymes used to breakdown milk in prep for cheesemaking-ergo the "deviding" factor(?). Also one of it's main enzymes is Pepsin which is main protagonist in acid production& consequent damage in stomach etc.(again: neg. ?). But it's really a "modifier" so?? That could be positive or negative within a choir. Did I just confuse the whole issue more?hmmm,sry if so, know You've got me wondering!:-). Where's the quote from? Enjoy the Holidays!