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Differentiation of heterocysts in Anabaena strains. Alcian blue-stained light photomicrographs of vegetative cells and heterocysts of strains An7120 (A) and AnFPNhetR (B) are shown. Photomicrographs of a 15-day-old culture of strain AnFPNhetR showing chains of heterocysts and their detachment under static culture conditions (C) or under agitation (D) are also shown. Bar, 10 μm; magnification, ×600.
