About the Authors
Laboratory of Neuroendocrinology, The Rockefeller University, New York, New York, United States of America
The authors have declared that no competing interests exist.
Conceived and designed the experiments: RGH BM. Performed the experiments: RGH RB EB AC KMM. Analyzed the data: RGH EB AC KMM. Wrote the paper: RGH BM.