From the Department of Genetics, Harvard Medical School, Boston, MA.

Conflicts of Interest and Source of Funding: The author has disclosed that he has no significant relationships with, or financial interest in, any commercial companies pertaining to this article.

Reprints: Raju Kucherlapati, PhD, Department of Genetics, Harvard Medical School, 77 Avenue Louis Pasteur, Boston, MA. E-mail: [email protected].