About the Authors
National Center for Biotechnology Information, National Library of Medicine, National Institutes of Health, Bethesda, Maryland, United States of America
The authors have declared that no competing interests exist.
Conceived and designed the experiments: YAK TMP. Performed the experiments: YAK. Analyzed the data: YAK SW TMP. Wrote the paper: YAK SW TMP. Designed the experiments: YAK. Participated in designing the experiments: SW.