[1] Johns Hopkins Univ, Baltimore, MD USA
[2] Princeton Univ, Princeton, NJ USA
[3] Princeton Univ, Dept Chem & Biol Engn, Princeton, NJ USA
[4] Princeton Univ, Dept Mech & Aerosp Engn, Princeton, NJ USA
[5] Princeton Univ, Dept Mol Biol, Princeton, NJ USA
[6] Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD USA