C. elegans strains used in this study

aCaenorhabditis Genetics Center.bNational BioResource Project.cAfter outcrossing VC228 strain with N2 at least six times.dAfter outcrossing FX00474 strain with N2 at least six times.eThe cDNA nlg-1 coding region was obtained from clone yk1657a10 from Yuji Kohara, National Institute of Genetics, Mishima, Japan.fThe cDNA human NLGN1 coding region was obtained from clone KIAA1070 (hj05602), Kazusa DNA Research Institute, Japan.gRat Nlgn-1::EGFP was a gift from Dr. Thomas Dresbach, Univ. Göttingen, Germany.