JUAN GAERTNER / SCIENCE PHOTO LIBRARY JUAN GAERTNER / SCIENCE PHOTO LIBRARY
Transmembrane proteins. Illustration of five transmembrane proteins. Left to right are: a potassium channel with a potassium ion, a delta opioid receptor with bound endorphin molecule, an LDL (low-density lipoprotein) receptor with bound LDL particle, an acetylcholine receptor with acetylcholine molecule, and a histamine receptor with histamine molecule.
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