Question

What is acetylcholin receptor??

Answer 1

acetylcholine receptor (abbreviated AChR) is an integral membrane protein that responds to the binding of acetylcholine, a neurotransmitter. 

Answer 2

Heya,
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The acetylcholine receptor is a cellular receptor for rabies virus. The binding of the virus to acetylcholine receptors, which are present with a high density at the neuromuscular junction, would provide a mechanism such that the virus could be locally concentrated at sites in proximity to peripheral nerves facilitating subsequent uptake and transfer to the central nervous system.
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in other words,
acetylcholine receptor is a cellular receptor(.a.k.a. a protein molecule that receives chemical signals from outside a cell.) for rabies virus 
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hope this helped u,
cheers