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Cytotoxic ribonucleases found in the oocytes and early embryos of frogs with antitumor activity are well-documented. RC-RNase 2, a cytotoxic ribonuclease isolated from oocytes of bullfrog Rana catesbeiana, consists of 105 residues linked with 4 disulfide bridges and belongs to the bovine pancreatic ribonuclease (RNase A) superfamily. Among the RC-RNases, the base preference for RNase 2 is UpG but...
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