Semiquantitative RT-PCR analysis of P. aeruginosa cells after 2 h of induction with pyruvate (P), GB, DMG (D), or sarcosine (S). PA5410 (gbcA), PA5411 (gbcB), PA5398 (dgcA), PA5399 (dgcB), and PA5380 (gbdR) transcript levels are shown. rplU was used as a control transcript.