TY - JOUR T1 - Evidence of protein collective motions on the picosecond timescale JF - Biophysical Journal Y1 - 2011 A1 - He, Yunfen A1 - Chen, J-Y A1 - Knab, Joseph R A1 - Zheng, Wenjun A1 - Markelz, Andrea G VL - 100 SN - 0006-3495 ER -