4.1.3.16	7.5	8	condensation, elimination	5237	
4.1.3.16	8.1	-	2-keto-4-hydroxybutyrate cleavage	5238	
4.1.3.16	8.8	-	-	5255	
4.1.3.16	8.8	-	2-keto-4-hydroxyglutarate cleavage	5238, 5243, 5255