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#acetylcholine #neurotransmitter #receptor activation #cell signaling #neuromuscular junction #cholinergic receptor

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#acetylcholine #neurotransmitter #espanys #neural signaling #nervous system #brain chemical #receptor activation

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#touch sensation #impact pain #temperature reading #hand sensor #somatosensory system #physical feeling #receptor activation

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#shh signaling cascade #intracellular signaling #biochemical pathway #receptor activation #gene regulation #cell proliferation #signal propagation