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Alignment of partial amino acid sequences corresponding to the cyanobacterial NaDTs of A. circinalis 279B, Synechocystis sp. strain PCC6803, and Nostoc sp. strain PCC7120, together with mrpF gene products of B. subtilis and B. firmus. Regions of identity and similarity are shown as follows: stars, fully conserved positions; stacked double dots, strongly conserved residues; single dots, weakly conserved residues.
