Hi did you ever solve this prblem? Tamar Michaeli -- Tamar Michaeli, Ph.D. Albert Einstein College of Medicine Dept. of Developmental and Molecular Biology Chanin, Room 503 1300 Morris Park Avenue Bronx, NY 10461 (Tel) 718-430-2138 (eFax) 253-276-0348 (Fax) 718-430-8567