si_0156 Heterocyst_formation_in_cyanobacteria Heterocyst formation inhibiting signaling peptide PatS si_0156 Heterocyst_formation_in_cyanobacteria Protein FraG required for filament integrity and heterocyst maturation si_0156 Heterocyst_formation_in_cyanobacteria Main regulator of heterocyst differentiation HetR si_0156 Heterocyst_formation_in_cyanobacteria Nitrogen-responsive response regulator NrrA si_0156 Heterocyst_formation_in_cyanobacteria Global nitrogen regulatory protein, CRP family of transcriptional regulators si_0156 Heterocyst_formation_in_cyanobacteria Heterocyst differentiation protein HetP si_0156 Heterocyst_formation_in_cyanobacteria Heterocyst differentiation protein HetC