L-arabinose operon
（重定向自Arabinase）
The L-arabinose operon, also called the ara or araBAD operon, is an operon that encodes enzymes needed for the catabolism of arabinose in Escherichia coli. It has both positive and negative regulation and is activated allosterically.
It has been a focus for research in molecular biology since 1970, and has been investigated extensively at its genetic, biochemical, physiological, and biophysical levels.