MUC2 and hydrops fetalis: We found that healthy HF-MUC2 O-glycans were able to show significant increases in the production of valeric acid and isocaproic acid (p < 0.05, Students t test, n = four-fifths per group), and a trend toward increases in butyric acid versus CD HF-MUC2 independent of disease status (Fig. 6F).