helix-turn-helix motif

β-galactosidase

operon model

operator site

repressor

lac repressor

lac operator

inducer

isopropylthiogalactoside (IPTG)

pur repressor

corepressor

catabolite repression

catabolite activator protein (CAP)

λ repressor

CRO

quorum sensing

autoinducer

biofilm

attenuation