2.4.2.17 histidine metabolism histidine metabolism - - 2.4.2.17 Biosynthesis of secondary metabolites - 01110 - 2.4.2.17 Histidine metabolism - 00340 - 2.4.2.17 L-histidine biosynthesis - - HISTSYN-PWY 2.4.2.17 Metabolic pathways - 01100 -