. "\"Catalysis of the hydrolysis of ester linkages within ribonucleic acid by creating internal breaks.\" [GOC:mah, ISBN:0198547684]" . . "endoribonuclease activity" . "Reactome:REACT_22313 \"Cleavage of Xbp1 mRNA by IRE1alpha and Splicing of Cleaved Xbp1 mRNA, Homo sapiens\"" . "Reactome:REACT_75787 \"SMG6 Cleaves mRNA with Premature Termination Codon, Homo sapiens\"" . . . "endonuclease G activity" .