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Topology of the genes encoding high-affinity phosphate transport in Crocosphaera watsonii and Synechocystis PCC6803. The genes pstS, -A, -B, and -C are designated with single letters; sphX, a member of the same gene family as pstS (1, 16), is also designated. Shading indicates the genes being compared with the percent similarity of each pair.
