The positions of 79 marker genes on the completed genomes of four cyanobacteria of 4 morphotypes.

A: Prochlorococcus marinus MIT 9301 (high-light-adapted, 31.3 mol% G+C, 1.64 Mbp).
B: Gloeobacter violaceus PCC 7421 (the root organism, 62.0 mol% G+C, 4.66 Mbp).
C: Arthrospira platensis PCC 8005 (filamentous non-heterocystous, 44.7 mol% G+C, 6.23 Mbp).
D: Nostoc punctiforme PCC 73102 (filamentous heterocystous, 41.4 mol% G+C, 8.23 Mbp).

Figures were prepared with BRIG (NF Alikhan, NK Petty, NL Ben Zakour, SA Beatson (2011) BLAST Ring Image Generator (BRIG): simple prokaryote genome comparisons, BMC Genomics, 12:402)