We thank Mr. Suck Jong You for his help with the Southern hybridization experiment. We also thank the Caenorhabditis Genetics Center, which is funded by the NIH National Center for Research Resources (NCRR), for providing the C. elegans N2 strain. The cDNA clones used in this study were kindly provided by Dr. Lester at Caltech and by Dr. Numa's group at Kyoto University. This study was supported by a grant (GE96-96) to N.J.C. from the Ministry of Education, Republic of Korea, and by KOSEF 971-0506-048-2 and SNU 97-06-2089 to B.-K.K.

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