[1] John A Burns Sch Med, Dept Anat Biochem & Physiol, Honolulu, HI 96813 USA
[2] James Madison Univ, Dept Biol, Harrisonburg, VA 22807 USA
[3] Catholic Univ Korea, Dept Anat, Seoul 06591, South Korea
[4] Med Univ Varna, Dept Anat & Cell Biol, BG-9002 Varna, Bulgaria
[5] Heidelberg Univ, Dept Anat & Cell Biol, DE-69120 Heidelberg, Germany