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YOKO HATTA,1 JUN OHASHI,1 TADASHI IMANISHI,2 HARUO KAMIYAMA,3 MASAHARU IHA,3 TSUYOSHI SIMABUKURO,3 ATSUKO OGAWA,4 HIDENORI TANAKA, TATSUYA AKAZA,4 TAKASHI GOJOBORI,2 TAKEO JUJI,4 AND KATSUSHI TOKUNAGA1

1 Department of Human Genetics, Graduate School of Medicine, University of Tokyo, Tokyo, Japan.

2 Center of Information Biology, National Institute of Genetics, Mishima, Japan.

3 Okinawa Red Cross Blood Center, Okinawa, Japan.

4 Japanese Red Cross Central Blood Center, Tokyo, Japan.

Received 22 June 1998; revision received 6 October 1998.