GABA A (rho) receptors are highly expressed in the retina and are functional homopentamers of rho subunits. These receptors were formerly called GABA C receptors.
The GABA(A)-rho receptor (GABRR) is expressed in many areas of the brain, but in contrast to other GABA(A) receptors, has especially high expression in the retina. It is functional as a homopentamer and is permeable to chloride ions when GABA binds to it (Cutting et al. 1991, Cutting et al. 1992, Bailey et al. 1990).
chloride channel activity of GABRR pentamers:GABA [plasma membrane]