Phosphate transport ( pst ) operon and surrounding region in S. tropica CNB-440. Red box indicates synteny of pst between S. tropica CNB-440 and Synechococcus elongatus PCC6301. Yellow box indicates synteny between S. tropica CNB-440 and Micromonospora sp. L5. The GI numbers are listed for S. elongatus PCC6301, the locus tags are given for the S. tropica and Micromonospora genomes.