[1] MICHIGAN STATE UNIV,DEPT MED,E LANSING,MI 48824
[2] MICHIGAN STATE UNIV,DEPT PHARMACOL,E LANSING,MI 48824
[3] CATHOLIC UNIV NIJMEGEN,DEPT SUBMICROSCOP MORPHOL,NIJMEGEN,NETHERLANDS
[4] CATHOLIC UNIV NIJMEGEN,DEPT ANAT & EMBRYOL,NIJMEGEN,NETHERLANDS