上游充通大￥ SHANGHAI JIAO TONG UNIVERSITY Example of Repression of Transcription阻遏例子 Repression Enzymes involved in formation of arginine Cell number. Total are synthesized only protein when arginine is absent from the medium Arginine added External arginine represses the synthesis Arginine biosynthesis of these enzymes. enzymes Time 2012 Pearson Education,inc.Chen Feng, Shanghai Jiao Tong University Example of Repression of Transcription阻遏例子 Enzymes involved in formation of arginine are synthesized only when arginine is absent from the medium External arginine represses the synthesis of these enzymes