English translation: enzyme soluble/soluble through enzymes
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a protein soluble by fermentation/digestible via fermentation
Explanation: Lacking much in the way of context, I would think they are referring to the process of fermentation in protein digestion. Maybe the websites will help some.
Concentrations of protein fermentation products are higher in the left sided (distal) colon as compared to the right sided (proximal) colon suggesting that protein fermentation is more prevalent in the distal colon.