- Further evidence for clustering of human GABAA receptor subunit genes: localization of the alpha 6-subunit gene (GABRA6) to distal chromosome 5q by linkage analysis. Hicks, A.A., Bailey, M.E., Riley, B.P., Kamphuis, W., Siciliano, M.J., Johnson, K.J., Darlison, M.G. Genomics (1994)