<p>The 43kDa postsynaptic protein is a peripheral membrane protein thought to be involved in the anchoring or stabilisation of the nicotinic acetylcholine receptor at synaptic sites [<cite idref="PUB00001573"/>, <cite idref="PUB00005537"/>]. It may link the receptor to the postsynaptic cytoskeleton through direct association with actin or spectrin. The 43 kDa protein is highly conserved across species. Two highly conserved regions, one encompassing the N terminus and the other near the C terminus, may be important for interaction of the protein with other components of the postsynaptic membrane.</p>