Acknowledgments
We express our gratitude to Dr Oshima of Tohoku
University, Dr Noguchi of Nagasaki University, and the
Fisheries Agency of Japan for providing the PSP toxin
standards. We thank Dr Yamazaki of National Research
Institute of Aquaculture for collecting the shellfish samples,
and Mrs Kaoru Sasaki for the sample preparation. This study
was supported by a grant from the Ministry of Agriculture,
Forestry and Fisheries of Japan.