About the Authors
Department of Neurobiology and Anatomy, W. M. Keck Center for the Neurobiology of Learning and Memory, The University of Texas Medical School at Houston, Houston, Texas, United States of America
The authors have declared that no competing interests exist.
Conceived and designed the experiments: PS DAB JHB. Performed the experiments: PS. Analyzed the data: PS DAB JHB. Contributed reagents/materials/analysis tools: PS DAB. Wrote the paper: PS DAB JHB.