
(A) The proportion of paralogous proteins is plotted for membrane proteins vs. nonmembrane proteins in 16 organisms (see Table 1for abbreviations). A paralog is defined by the Smith-Waterman score of 150 or more by SSEARCH after preprocessing with SEG. (B) The proportion of paralogous proteins is plotted against the total number of membrane or nonmembrane proteins in 16 organisms. (x) Membrane proteins, (•) nonmembrane proteins.











