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The ultrastructure of heterocysts from the mutant SR652 in comparison to the wild type of Anabaena. (A,B) Heterocyst of the wild type. Triangles indicate the laminated hgl layer, the star points to a preparation artifact due to dehydration during sample preparation. (C–G) SR652 mutant heterocysts. Arrows show an anomalous layer between the cytoplasmic membrane and the polysaccharide layer, which sometimes appears within the hgl layer (G). Bars, 0.4 μm.
