Examlex
Doctor's services consist mainly of elements.
Steroids
A large class of organic compounds with a characteristic molecular structure containing four rings of carbon atoms; they include many hormones, alkaloids, and vitamins.
Intracellular Receptors
Proteins located inside the cell that bind to certain substances and initiate a specific cellular response.
First Messenger
A signaling molecule that binds to a receptor on the cell surface, initiating a signal transduction process that leads to the formation of an intracellular second messenger.
Ion Channel
An ion channel is a protein structure embedded in cell membranes that allows ions to pass through the membrane selectively.
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