Schematic representation of transmembrane proteins: 1. a single transmembrane ?-helix (bitopic membrane protein) 2. a polytopic ?-helical protein 3. a transmembrane ? barrel. The membrane is represented in light brown.

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Schematic representation of transmembrane proteins: 1. a single transmembrane ?-helix (bitopic membrane protein) 2. a polytopic ?-helical protein 3. a transmembrane ? barrel. The membrane is represented in light brown.