[1] Columbia Univ, Phys, New York, NY USA
[2] Yale Univ, Cellular & Mol Physiol, New Haven, CT USA
[3] Yale Univ, Nanobiol Inst, West Haven, CT USA
[4] Yale Univ, Mol Biophys & Biochem, New Haven, CT USA
[5] CNRS, Fondament & Biomed, Paris, France
[6] Columbia Univ, Chem Engn, New York, NY USA