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Compared with normals, the decrease in quantal size observed in familial infantile myasthenia would be most consistent with a. fewer calcium channels in the presynaptic terminals. b. a greater rate of spontaneous exocytosis depleting the size of the vesicle pool. c. smaller synaptic vesicles. d. a change in the sensitivity of the calcium release mechanism. e. a loss of all ACh receptors at the neuromuscular junction.

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