When a motor neuron forms a synapse to a muscle fiber, (A)________ levels are up regulated by Neuregulin. In addition, (B)_______ binds to its receptor MuSK and (C)_____ mediates the clustering of ACh receptors.
a. (A) NMDA receptor, (B) rapsyn, (C) CamKII
b. (A) NMDA receptor, (B) rapsyn, (C) MuSK
c. (A) ACh receptor, (B) agrin (C) rapsyn
d. (A) ACh receptor, (B) agrin (C) CamKII
Answer: c. (A) ACh receptor, (B) agrin (C) rapsyn
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