Glutamate-gated chloride channel subunit; channel properties may be modulated by the formation of heteromeric channels. Glutamate binding triggers a rapidly reversible current, while the anti-helmintic drug ivermectin triggers a permanently open channel configuration. Pentamer (By similarity). Expressed in motor neuron commissures at the anterior portion of the worms. Belongs to the ligand-gated ion channel (TC 1.A.9) family. Glutamate-gated chloride channel (TC 1.A.9.4) subfamily.