GCA_000020025.1 Npun_F0424 definition HNH endonuclease GCA_000020025.1 Npun_R0624 definition HNH endonuclease GCA_000020025.1 Npun_R2778 definition HNH endonuclease GCA_000020025.1 Npun_F3019 definition HNH endonuclease GCA_000020025.1 Npun_R5632 definition HNH endonuclease GCA_000020025.1 Npun_F6302 definition HNH endonuclease GCA_000020025.1 Npun_BF005 definition HNH endonuclease GCA_000020025.1 Npun_DF016 definition HNH endonuclease