2.4.2.1	purine-nucleoside phosphorylase	purine ribonucleosides degradation	-	
2.4.2.15	guanosine phosphorylase	purine ribonucleosides degradation	-	
3.5.4.4	adenosine deaminase	purine ribonucleosides degradation	-	
5.4.2.7	phosphopentomutase	purine ribonucleosides degradation	-