Reaction catalyzed by purine-nucleoside phosphorylase (2.4.2.1), uridine phosphorylase (2.4.2.3), S-methyl-5'-thioinosine phosphorylase (2.4.2.44)

		+			=			+
	inosine	+		phosphate	=		hypoxanthine	+		alpha-D-ribose 1-phosphate