發(fā)布日期:2006-04-15 來(lái)源:- 作者:428 x 483 像素
核心提示:a) Two promoters
(dark gray boxes) upstream of two genes (boxes with lower-
case letters) are controlled by protein A (proteins are repre-
sented by capital letters inside circles). Protein B represses
gene c and protein C represses gene b. b) Th