Congenital Disorder of Glycosylation, Type Ib, also known as cdg1b, is related to protein-losing enteropathy and congenital disorder of glycosylation, type in, and has symptoms including diarrhea and vomiting. An important gene associated with Congenital Disorder of Glycosylation, Type Ib is MPI (Mannose Phosphate Isomerase). Affiliated tissues include liver and brain, and related phenotypes are abnormal circulating enzyme concentration or activity and hepatomegaly