About the Authors
Laboratory of Pharmacology, Instituto Butantan, São Paulo, São Paulo, Brazil
The authors have declared that no competing interests exist.
Conceived and designed the experiments: PFS. Performed the experiments: RF. Analyzed the data: RF PFS. Contributed reagents/materials/analysis tools: PFS. Wrote the paper: PFS. Involved in drafting the article or revising it critically for important intellectual content, and approved the final version to be submitted for publication: PFS RF.