Fig. S1, acetylene reduction assay with hetC mutant strains
Fig. S2, source cells are not present at 0 h after the induction of differentiation
Fig. S3 and S4, short cell intervals between heterocysts do not display measureable signal ranges
Fig. S5, transcription of hetN is unaltered in heterocysts produced by strains containing a hetC mutation
Fig. S6, degradation of HetR-CFP in response to RGSGR peptide
Table S1, patterns of heterocysts
Tables S2 and S3, statistical analyses of differences in signal ranges
Table S4, strains, plasmids, and oligonucleotide primers
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