Reaction catalyzed by pyrimidine-nucleoside phosphorylase (2.4.2.2), uridine phosphorylase (2.4.2.3), thymidine phosphorylase (2.4.2.4)

		+			=			+
	thymidine	+		phosphate	=		thymine	+		2-deoxy-alpha-D-ribose 1-phosphate