Restriction enzymes: commercial source

All endonucleases bellow are isoschizomers
Recognition sequence (?): CG'GWC_CG

CpoI

 Fermentas AB
 Takara Shuzo Co. Ltd.

CspI

 Promega Corporation

RsrII

 New England Biolabs
 CHIMERx
 EURx Ltd.

Rsr2I

 SibEnzyme Ltd.
 MRC-Holland