Jonathan L. Tilly, Ph.D.

The Vincent Center for Reproductive Biology, Department of Obstetrics and Gynecology, Massachusetts General Hospital/Harvard Medical School,Boston, MA 02114 USA

Received 12/14/95; Accepted 12/29/95; On-line 1/1/96

The work conducted by the author and discussed herein was supported in part by grants from the National Institutes of Health (HD31188, AG12279, ES06999, HD34226, Office of Research on Women's Health) and the American Federation for Aging Research. The author would like to thank Dr. Isaac Schiff and Ms. Kim I. Tilly (Vincent Center for Reproductive Biology, Department of Obstetrics and Gynecology, Massachusetts General Hospital/Harvard Medical, Boston, MA) for their critical review of this article prior to its submission.