Animals 2 Ca2+ permeability Calcium 2 Cations, Divalent 2 Chrna9 protein, rat 2 Electrophysiology 2 Female 2 Hair Cells, Outer 2 IC 50 2 Ligand-gated channel 2 Magnesium 2 Neurotransmitter receptor channel 2 Nicotinic receptor 2 Olivocochlear efferent synapse 2 Oocytes 2 Outer hair cell 2 Permeability 2 Protein Subunits 2 Rats 2 Receptors, Nicotinic 2 Recombinant Proteins 2 Synaptic Transmission 2 Voltage-dependent blockage 2 Xenopus laevis 2 acetylcholine 2 animal 2 article 2 barium ion 2 calcium 2 calcium ion 2