1. Department of Anthropology, University of Colorado, Boulder, CO 80309-0233.
2. Laboratoire d'Anthropologie, Faculté Nord, Université de Provence, 13326 Marscille, France.
3. U.R.A. 36, Centre de Recherches Archéologiques, C.N.R.S., Sophia Antipolis, 06565 Valbonne, France.
4. Department of Cell Biology and Anatomy, Johns Hopkins University, School of Medicine, Baltimore, MD 21205.
5. Centro di Studio per la Geocronologia e Geochimica delle Formazioni Recenti, CNR, Universita La Sapienza, Rome, Italy.