FIG. 1.

Genetic organization of slr1856, slr1859, slr1860/icfG, and slr1861. Shown is the gene map from the Cyanobase database (18) outlining the relative positions of ORFs slr1856, slr1859, slr1860/icfG, and slr1861 within the complete nucleotide sequence of Synechocystis sp. strain PCC 6803. ORFs are labeled by arrows whose sizes and orientations indicate their relative lengths and the directions in which they are presumed to be transcribed. slr1857 encodes a potential homolog of GlgX, a glycogen-debranching enzyme (34). Homologs for the remaining ORFs, slr1852 to -1855 and slr1862, have yet to be identified.