5564 Reference proteome 1366 Membrane 1202 Transmembrane 1160 Transmembrane helix 723 Signal 650 3D-structure 550 Metal-binding 527 Transferase 511 Cell membrane 463 Nucleotide-binding 432 Transport 415 Cytoplasm 388 ATP-binding 383 Coiled coil 366 Hydrolase 345 Oxidoreductase 301 Cell inner membrane 278 DNA-binding 213 Iron 189 Transcription 181 Transcription regulation 169 Magnesium 164 Phosphoprotein 142 Zinc 134 Lyase 126 Flavoprotein 108 NAD 102 Iron-sulfur 101 Kinase 96 Amino-acid biosynthesis