a
Department of Engineering Science and Mechanics, The Pennsylvania State University, University Park, USA
E-mail: junhuang@psu.edu
;
Fax: 814-865-9974
;
Tel: 814-863-4209
b
Cell and Developmental Biology Program, The Pennsylvania State University, University Park, USA
c
Ascent Bio-Nano Technologies Inc., State College, USA
d
National Heart, Lung, and Blood Institute at NIH, Bethesda, USA