Correspondence: Yukifumi Nawa, paras@macqm.miyazaki-med.ac.jp
Haruhiko Maruyama
Yukifumi Nawa
Department of Parasitology, Miyazaki Medical college, Kiyotake, Miyazaki 889-16, Japan.

Shinichi Noda
Department of Medical Zoology, Faculty of Medicien, Kagoshima University, 8-35-1 Sakuragaoka, Kagoshima 890, Japan.

Tatsuyuki Mimori
Department of Tumor Genetics and Biology, Kumamoto University Medical School, 2-2-1 Honjo, Kumamoto 860, Japan.