As expected , expression of known AraC-regulated genes , i.e. , araB , araA , araD , araE , araF , araG , araH , and araJ , increased substantially upon addition of arabinose in wild-type cells and was substantially higher in wildtype cells than araC cells in the presence of arabinose ( Table 2 ) .
With the exception of xylA , the last AraC-regulated gene to be identified was araJ , more than 30 years ago ( 27 ) .