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

乳操纵元是诱导的操纵元；色氨酸操纵元是阻遏的操纵元。

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

植物病原原核生物中研究得的是胡萝卜软腐菌的果胶酸内裂解酶。