RNA endonuclease activity phosphorus-oxygen lyase activity ribonuclease T1 activity https://github.com/geneontology/go-ontology/issues/24408 https://github.com/geneontology/go-ontology/issues/28176 https://github.com/geneontology/go-ontology/issues/30193 RNase T1 guanyloribonuclease activity ribonuclease F1 ribonuclease Ch RNase N2 activity binase activity Catalysis of the endonucleolytic cleavage to nucleoside 3'-phosphates and 3'-phosphooligonucleotides ending in Gp with 2',3'-cyclic phosphate intermediates. ribonuclease U1 ribonuclease PP1 RNase G molecular_function ribonuclease guaninenucleotido-2'-transferase (cyclizing) RNase T1 activity guanyl-specific RNase activity Aspergillus oryzae ribonuclease activity EC:4.6.1.24 RNase N1 activity ribonuclease C2 ribonuclease SA GO:0046589 RNase Sa ribonuclease N1 ribonuclease N3 RNase F1