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Physical genome map of the unicellular cyanobacterium Synechococcus sp. strain PCC 7002

A physical restriction map of the genome of the cyanobacterium Synechococcus sp. strain PCC 7002 was assembled from AscI, NotI, SalI, and SfiI digests of intact genomic DNA separated on a contour-clamped homogeneous electric field pulsed-field gel electrophoresis system. An average genome size of 2.7 x 10(6) bp was calculated from 21 NotI, 37 SalI, or 27 SfiI fragments obtained by the digestions. The genomic map was assembled by using three different strategies: linking clone analysis, pulsed-field fragment hybridization, and individual clone hybridization to singly and doubly restriction-digested large DNA fragments. The relative positions of 21 genes or operons were determined, and these data suggest that the gene order is not highly conserved between Synechococcus sp. strain PCC 7002 and Anabaena sp. strain PCC 7120.