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

乳糖是诱导的；色氨酸是阻遏的。

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

植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。