Restriction enzymes: commercial source

 SibEnzyme Ltd.
 MRC-Holland

 Nippon Gene Co., Ltd.
 New England Biolabs
 CHIMERx
 Promega Corporation
 Bangalore Genei
 EURx Ltd.

 Takara Shuzo Co. Ltd.

 CHIMERx
 EURx Ltd.

 New England Biolabs

 Fermentas AB