This family includes the ScaI (recognises and cleaves AGT^ACT) restriction endonuclease.

1: Cloning and expression of the ApaLI, NspI, NspHI, SacI, ScaI, and SapI restriction-modification systems in Escherichia coli. Xu SY, Xiao JP, Ettwiller L, Holden M, Aliotta J, Poh CL, Dalton M, Robinson DP, Petronzio TR, Moran L, Ganatra M, Ware J, Slatko B, Benner J; Mol Gen Genet. 1998;260:226-231. PMID:9862476

2: Sequence, structure and functional diversity of PD-(D/E)XK phosphodiesterase superfamily. Steczkiewicz K, Muszewska A, Knizewski L, Rychlewski L, Ginalski K; Nucleic Acids Res. 2012;40:7016-7045. PMID:22638584