S-like RNases have been found widely in plants [18]. They
consist of ~220e~240 amino acid residues. The enzymes, however,
differ between carnivorous plants and non-carnivorous plants in
several aspects [15]. For example, carnivorous plant-specific amino
acid residues are found at positions 85 (Asn),111 (Ser),115 (Ser) and
135 (Glu) (Fig. 1A, B) [15]. No conservation is found at these