1. Graduate School of Agricultural Science; Tohoku University; 1-1 Tsutsumidori-Amamiyamachi, Aoba-ku Sendai, Miyagi 981-8555 Japan
2. Tama Laboratory, Japan Food Research Laboratories; 6-11-10 Nagayama, Tama-shi Tokyo 206-0025 Japan
3. Institute of Legal Medicine; University of Frankfurt; Kennedyallee 104 60596 Frankfurt Germany