This family includes the HindIII (recognises and cleaves A^AGCTT) restriction endonuclease.

1: Cloning, analysis and expression of the HindIII R-M-encoding genes. Nwankwo DO, Moran LS, Slatko BE, Waite-Rees PA, Dorner LF, Benner JS, Wilson GG; Gene. 1994;150:75-80. PMID:7959067

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