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2013 doi: 10.1038/ncb2659

A few mention gastrointestinal upset with certain fillers or coatings

(2007) showed that recombinant mouse AAIII exhibits high activity toward the N -acetyl derivatives of tyrosine, phenylalanine, tryptophan, histidine, and lysine (-positional isomer) but is inactive toward the N -acetyl derivatives of cysteine, aspartic acid, and lysine (-positional isomer)

Finally, in severely diabetic NOD mice, low-dose anti-CD3 (35 mcg) and lesgaberan, a GABA-B receptor agonist (0.08mg/ml in drinking water), rapidly lowered blood glucoses and preserved functional -cells over a 25-week treatment period (55)