Alanine, cysteine, glycine, serine, and threonine are amino acids whose breakdown yields pyruvate. Tryptophan can be considered a member of this group since one of its degradation products is alanine, which is converted to pyruvate by transaminase, alanine transaminase, aminotransferase, alanine aminotransferase, PLP and its full name, and PMP and its full name have all been tried. What else could the blank be?