1. There are repression mechanisms like passive and active repressions. short-distance or long-distance repressions, the molecular basis of which is either inhibition of the activity of general transcriptional machinery, or formation of repressive chromatin structures.
基因抑制从形式上可以分成主动抑制和被动抑制，近程抑制和远程抑制等，但是其分子基础是抑制转录机器复合物（transcriptionalmachinery）或形成抑制性在染色体结构如异染色质等。