The GABAa receptor is made up of five subunit proteins. Each subunit transverses the postsynaptic membrane in a generally symmetrical manner. The five subunits are arranged to form a central pore, which, when opened, allows for the passage of chloride ions into the postsynaptic neuron. The GABAa receptor molecule has a specific site at which molecules of GABA bind. The interactions between neurotransmitter and receptor at this site do not involve the formation of chemical bonds, but do result in changingthe conformation of the receptor to consequently open up the central pore. Opening this pore allows for the influx of chloride ions and the initiation of an IPSP. After recognition, GABA is released from the receptor and taken up by surrounding glial cells, which recycle the neurotransmitter for future use.