B = Life Technologies
C = Minotech Biotechnology
E = Agilent Technologies
I = SibEnzyme Ltd.
J = Nippon Gene Co., Ltd.
K = Takara Bio Inc.
M = Roche Applied Science
N = New England Biolabs
O = Toyobo Biochemicals
Q = Molecular Biology Resources - CHIMERx
R = Promega Corporation
S = Sigma Chemical Corporation
V = Vivantis Technologies
X = EURx Ltd.
Y = SinaClon BioScience Co.