Sequence alignment of NblA homologues. PCC7120, Nostoc sp. (Chr, chromosome [accession no. BAB76216]; PD, plasmid Delta [BAB77423]); PCC7937, Ananbaena variabilis (ABA22990); PCC73102, Nostoc punctiforme (ZP00345234); BP-1, Thermosynechococcus elongates (NP680824); PCC7601, Tolypothrix sp. strain PCC7601 (CAD28153); PCC6803, Synechocystis sp. (1, BAA17955; 2, BAA17954); PCC7942, Synechococcus sp. (ABB58157); PORPU, Porphyra purpurea (NP053976); AGLNE, Aglaothamnion neglectum (P48446); CYACA, Cyanidium caldarium (NP045072); CYAME, Cyanidoschyzon merolae (BAC76137). Conserved residues among the NblAs are shown in boxes (6). Amino acid residues binding to the PBS are marked with asterisks (6).