Edelstein, S., Biochemistry Department, The Weizmann Institute of Science, Rehovot, Israel
Sheves, M., Department of Organic Chemistry, The Weizmann Institute of Science, Rehovot, Israel
Mazur, Y., Department of Organic Chemistry, The Weizmann Institute of Science, Rehovot, Israel
Bar, A., Institute of Animal Science, Agricultural Research Organization, Bet-Dagan, Israel
Hurwitz, S., Institute of Animal Science, Agricultural Research Organization, Bet-Dagan, Israel

[No abstract available]