| Enzyme | Restriction site | Origin | Temperature |
| MabI | ...A CCWGGT... ...TGGECC A... | Microbacterium arborescens | 37 oC |
| MaeI | ...C TAG... ...GAT C... | Methanococcus aeolicus | 37 oC |
| MaeII | ...A CGT... ...TGC A... | Methanococcus aeolicus | 50 oC |
| MaeIII | ...N GTNACN... ...NCANTG N... | Methanococcus aeolicus | 55 oC |
| MamI | ...GATNN NNATC... ...CTANN NNTAG... | Microbacterium ammoniaphilum | 37 oC |
| MbiI | ...CCG CTC... ...GGC GAG... | Moraxella bovis | 37 oC |
| MboI | ...N GATCN... ...NCTAG N... | Moraxella bovis | 37 oC |
| MboII | ...GAAGANNNNNNNN N... ...CTTCTNNNNNNN NN... | Moraxella bovis | 37 oC |
| MfeI | ...C AATTG... ...GTTAA C... | Mycoplasma fermentans | 37 oC |
| MflI | ...R GATCY... ...TCTAG R... | Corynebacterium flavescens | 37 oC |
| MhlI | ...GDGCH C... ...C HCGDG... | Nesterenkonia halobia | 37 oC |
| MlsI | ...TGG CCA... ...ACC GGT... | Micrococcus luteus | 37 oC |
| MluI | ...A CGCGT... ...TGCGC A... | Micrococcus luteus | 37 oC |
| MluNI | ...TGG CCA... ...ACC GGT... | Micrococcus luteus | 37 oC |
| Mly113I | ...GG CGCC... ...CCGC GG... | Micrococcus lylae | 37 oC |
| MlyI | ...GAGTCNNNNN N... ...CTCAGNNNNN N... | Micrococcus lylae | 37 oC |
| MmeI | ...TCCRACNNNNNNNNNNNNNNNNNNNN N... ...AGGRTGNNNNNNNNNNNNNNNNNN NNN... | Methylophilus methylotrophus | 37 oC |
| MnlI | ...CCTCNNNNNNN N... ...GGAGNNNNNN NN... | Moraxella nonliquefaciens | 37 oC |
| Mph1103I | ...ATGCA T... ...T ACGTA... | Psychrobacter phenylpyruvicus | 37 oC |
| MroI | ...T CCGGA... ...AGGCC T... | Kocuria rosea | 37 oC |
| MroNI | ...G CCGGC... ...CGGCC G... | Kocuria rosea | 37 oC |
| MroXI | ...GAANN NNTTC... ...CTTNN NNAAG... | Kocuria rosea | 37 oC |
| MscI | ...TGG CCA... ...ACC GGT... | Micrococcus species | 37 oC |
| MseI | ...T TAA... ...AAT T... | Micrococcus species | 37 oC |
| MslI | ...CAYNN NNRTG... ...GTRNN NNYAC... | Moraxella osloensis | 37 oC |
| MspCI | ...C TTAAG... ...GAATT C... | Micrococcus species | 37 oC |
| MspI | ...C CGG... ...GGC C... | Moraxella species | 37 oC |
| Msp20I | ...TGG CCA... ...ACC GGT... | Micrococcus species | 37 oC |
| MspA1I | ...CMG CKG... ...GKC GMC... | Moraxella species | 37 oC |
| MspR9I | ...CC NGG... ...GGN CC... | Micrococcus species | 37 oC |
| MssI | ...GTTT AAAC... ...CAAA TTTG... | Methylobacterium species | 37 oC |
| MunI | ...C AATTG... ...GTTAA C... | Mycoplasma species | 37 oC |
| MvaI | ...CC WGG... ...GGW CC... | Kocuria varians | 37 oC |
| Mva1269I | ...GAATGCN N... ...CTTAC GNN... | Kocuria varians | 37 oC |
| MvnI | ...CG CG... ...GC GC... | Kocuria varians | 37 oC |
| MvrI | ...CGAT CG... ...GC TAGC... | Kocuria varians | not known |
| MwoI | ...GCNNNNN NNGC... ...CGNN NNNNNCG... | Methanothermobacter wolfeii | 60 oC |
| NaeI | ...GCC GGC... ...CGG CCG... | Lechevalieria aerocolonigenes | 37 oC |
| NarI | ...GG CGCC... ...CCGC GG... | Nocardia argentinensis | 37 oC |
| NciI | ...CC SGG... ...GGS CC... | Neisseria cinerea | 37 oC |
| NcoI | ...C CATGG... ...GGTAC C... | Gordonia rubripertincta | 37 oC |
| NdeI | ...CA TATG... ...GTAT AC... | Neisseria denitrificans | 37 oC |
| NdeII | ...N GATCN... ...NCTAG N... | Neisseria denitrificans | 37 oC |
| NgoMIV | ...G CCGGC... ...CGGCC G... | Neisseria gonorrhoeae | 37 oC |
| NheI | ...G CTAGC... ...CGATC G... | Neisseria mucosa heidelbergensis | 37 oC |
| NlaIII | ...NCATG N... ...N GTACN... | Neisseria lactamica | 37 oC |
| NlaIV | ...GGN NCC... ...CCN NGG... | Neisseria lactamica | 37 oC |
| NmuCI | ...N GTSACN... ...NCTSTG N... | Neisseria mucosa | 37 oC |
| NotI | ...GC GGCCGC... ...CGCCGG CG... | Nocardia otitidiscaviarum | 37 oC |
| NruI | ...TCG CGA... ...AGC GCT... | Nocardia rubra | 37 oC |
| NsbI | ...TGC GCA... ...ACG CGT... | Neisseria subflava | 37 oC |
| NsiI | ...ATGCA T... ...T ACGTA... | Neisseria sicca | 37 oC |
| NspI | ...RCATG Y... ...Y GTACR... | Nostoc species | 37 oC |
| Nsp V | ...TT CGAA... ...AAGC TT... | Nostoc species | 37 oC |