Expression of genes coding for putative porin-like proteins of Anabaena sp. RNA from Anabaena sp., AFS-I-hgdD, AFS-I-all2215, CSCW2, AFS-I-hgdC, and AFS-I-anaOmp85 grown in BG11 as well as genomic DNA from Anabaena sp. grown in BG11 were isolated and analyzed. RT-PCR/PCR was performed using oligonucleotides for the indicated genes listed in supplemental Table S1. The bottom panel shows the result in the absence of the reverse transcriptase. The genes for analysis were selected according to Refs. 18, 19, 22, and 24.