I guess that's what I'm looking for! Thanks Markus -- Markus Hoenicka UT Houston Medical School Dept. of Integrative Biology and Pharmacology 6431 Fannin MSB4.114 Houston, TX 77030 (713) 500-6313, -7476, -7477 (713) 500-7444 (fax) mhoen at farmr1.med.uth.tmc.edu http://ourworld.compuserve.com/homepages/hoenicka_markus