Sub-cellular localization (SCL) of SD1 proteins. SCL of 4502 proteins encoded by the SD1 genome was predicted using the bioinformatic algorithms PSORTb, SignalP, TatP, TMHMM, BOMP, LipoP and KEGG. 350 outer and inner membrane proteins corresponding to ca. 38% of the SD1 membrane proteome, and 1410 cytoplasmic and periplasmic proteins representing ca. 39% of SD1 soluble proteins were identified.