The lac operon is an inducible operon, whereas the trp operon is a repressible operon.

乳糖操是诱导的操；氨酸操是阻遏的操。

The best studied inducible and repressible enzyme in phytopathogenic prokaryotes is endo-pectate lyase in E. carotovora.

原原核生中研究得最清楚的是胡萝卜软腐菌的果胶酸内裂解酶。