DLD and type 1 diabetes mellitus: Moreover, we found that in the levels of four key enzymes in BCAA degradation were recovered in T1D mice after FMT such as leucine dehydrogenase (K00263), acyl-CoA dehydrogenase (K00249), BCAA aminotransferase (K00826) and dihydrolipoamide dehydrogenase (K00382) (Fig. 2i).