Reaction catalyzed by ribonuclease U2 (4.6.1.20)

	[RNA] containing adenosine	+		H2O	=		an [RNA fragment]-3\'-adenosine-3\'-phosphate	+		a 5\'-hydroxy-ribonucleotide-3\'-[RNA fragment]
	[RNA] containing adenosine	+		H2O	=		an [RNA fragment]-3'-adenosine-3'-phosphate	+		a 5'-hydroxy-ribonucleotide-3'-[RNA fragment]