Restriction enzymes: commercial source

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