2.3.1.37	5-aminolevulinate synthase	tetrapyrrole biosynthesis II (from glycine)	-	
2.5.1.61	hydroxymethylbilane synthase	tetrapyrrole biosynthesis II (from glycine)	-	
4.2.1.24	porphobilinogen synthase	tetrapyrrole biosynthesis II (from glycine)	-	
4.2.1.75	uroporphyrinogen-III synthase	tetrapyrrole biosynthesis II (from glycine)	-