Figure 5

Classified polytopic membrane domains in relation to the number of ORFs in the 26 genomes studied. (a, b) Plots of the number of classified polytopic membrane domains versus the number of ORFs in (a) all the studied genomes and (b) in genomes of single-celled organisms. The trend lines, though generated on the basis of data in each plot, have almost the same slope. CE^* in red indicates the number of classified polytopic membrane domains in C. elegans after the three big 7-TM chemoreceptor families are removed (see (c)). (c) The top ten families of polytopic membrane domains, as judged by their occurrence in C. elegans. (d) Plot of the number of classified families of polytopic membrane domains versus the logarithm of the number of ORFs in each genome.