Restriction enzymes: commercial source

 SibEnzyme Ltd.
 MRC-Holland

 Fermentas AB
 Nippon Gene Co., Ltd.
 Takara Shuzo Co. Ltd.
 Roche Applied Science
 New England Biolabs
 Toyobo Biochemicals
 CHIMERx
 Promega Corporation
 Sigma Chemical Corporationn
 Bangalore Genei
 EURx Ltd.

 Minotech Biotechnology