FIG. 2.

NblA Northern analysis of transcripts of wt Synechocystis strain PCC 6803 under different growth conditions as indicated, using nbl1 and nbl2 (A and B) as a probe. (A) Samples taken at various times after N starvation. (B) Samples taken after 4 h of growth on complete, −N, or −S medium. (C) Analysis of nblA-encoding transcripts of mutant strains N1LuxKm and N2Km compared to that of the wt, from 4 h of growth for cells grown in −N; nbl1 was used as a probe. The same blots were used for hybridization with the rnpB probe. Probes are described in Materials and Methods.