Available online at www.sciencedirect.com Developmental Biology – 434 www.elsevier.com/developmentalbiology Heterocyst patterns without patterning proteins in cyanobacterial filaments

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• Bacteria
• Microbiology
• Heterocyst
• Anabaena
• Diazotroph
• Cyanophycin
• Cellular differentiation
• Nitrogen cycle
• Nitrogen
• Biology
• Nitrogen metabolism
• Cyanobacteria