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The report by Alfred Hansel regarding the recent Hydrogenase meeting missed a point brought out by Gudrun Boison that unicellular cyanobacteria have hoxE as well as hoxF genes. They were cloned from Synechococcus in two different lambda inserts, and restriction analysis indicates that they are at least 16 kb apart from each other and maybe much further. The work has been published [Boison G et al., 1998: Curr. Microbiol 36(5): 253-258].