LAGUNA DESIGN / SCIENCE PHOTO LIBRARY LAGUNA DESIGN / SCIENCE PHOTO LIBRARY
Potassium ion channel protein structure. Molecular model of a KcsA potassium ion (K+) channel from Streptomyces lividans bacteria. Ion channels are membrane-spanning proteins that form a pathway for the movement of inorganic ions across cell membranes. This one is composed of four identical subunits. K+ channels have many functions including regulating hormone secretion, generating nerve impulses, and controlling the pace of the heart.
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