Of the A. marina chromosome nucleotide sequence (vs. itself) shows 18.7 of the sequence (not including the original, duplicated sequence) has a homology of greater than E 1 10 10 to another location on the chromosome. This is significantly higher than the 11.2 and 5.8 duplication in Synechocystis PCC6803 and Nostoc sp. PCC7120, respectively. A. marina actually has far fewer duplicated regions t