[1] NIA, Stem Cell Biol Unit, Neurosci Lab, Intramural Res Program,NIH, Baltimore, MD 21224 USA
[2] Univ Wisconsin, Waisman Ctr, Madison, WI 53705 USA
[3] Invitrogen Corp, Corp Res Labs, Carlsbad, CA 92008 USA
[4] Johns Hopkins Sch Med, Baltimore, MD 21287 USA
[5] Solexa Inc, Hayward, CA 94545 USA