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Table 5 The fraction of proteins predicted as transmembrane, and to contain re-entrant helices and signal peptides, in a number of complete genomes.

From: Transmembrane protein topology prediction using support vector machines

Species Fraction of genome predicted as TM proteins Fraction of TM proteins predicted to contain re-entrant helices Fraction of TM proteins predicted to contain signal peptides
Caenorhabditis elegans 33% 2% 33%
Canis familiaris 31% 2% 27%
Danio rerio 29% 2% 26%
Drosophila melanogaster 27% 2% 33%
Escherichia coli 24% 2% 28%
Homo sapiens 26% 2% 35%
Mus musculus 29% 2% 30%
Pan troglodytes 26% 2% 33%
Takifugu rubripes 33% 3% 26%
Xenopus tropicalis 31% 2% 23%