4.2.1.75	Biosynthesis of secondary metabolites	-	01110	-	
4.2.1.75	heme metabolism	heme metabolism	-	-	
4.2.1.75	Metabolic pathways	-	01100	-	
4.2.1.75	Microbial metabolism in diverse environments	-	01120	-	
4.2.1.75	Porphyrin and chlorophyll metabolism	-	00860	-	
4.2.1.75	tetrapyrrole biosynthesis I (from glutamate)	-	-	PWY-5188	
4.2.1.75	tetrapyrrole biosynthesis II (from glycine)	-	-	PWY-5189