During the development of specialized postsynaptic structures at a neuromuscular junction,preexisting AChR proteins on the surface of the uninnervated muscle are induced to aggregate by:
A)agrin,a signal released from the neuron.
B)the muscle membrane protein,MuSK.
C)the cytosolic protein,rapsyn.
D)all of the above

Question

Quizplus · Accepted Answer

All of the above options are correct. Agrin signals released from the neuron induce AChR aggregation via MuSK activation, and rapsyn interacts with the clustered AChR to stabilize and anchor them at the synapse.

During the Development of Specialized Postsynaptic Structures at a Neuromuscular