rk leucine-rich repeat-containing G protein-coupled receptor 2 BG:DS00180.13 lgr2 dLGR2 dlgr2/rk LGR2 Lgr2 Dlgr2 glycoprotein-hormone-receptor-II Rickets CT25644 Rk rickets dlgr2 CG8930 glycoprotein hormone receptor II DLGR2 DLgr2 DLGR-2 rk/CG8930 Glycoprotein hormone receptor II gene