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Structural organization of the cyr gene clusters from four cyanobacterial strains, including R. curvata CHAB1150, C. raciborskii AWT205 (31), Aphanizomenon sp. strain 10E6 (50), and Oscillatoria sp. strain PCC 6506 (28). Gray and white symbols, rearranged cyr genes; black symbols, transposase genes or vestiges thereof.
