Functional gene group analysis indicates no role for heterotrimeric G proteins in cognitive ability. oleh W David Hill, Christiaan de Leeuw, Gail Davies, David Cherry McLachlan Liewald, Anthony Payton, Leone C A Craig, Lawrence J Whalley, Mike Horan, William Ollier, John M Starr, Neil Pendleton, Danielle Posthuma, Timothy C Bates, Ian J Deary