Before revision:  Each MD trajectory was divided into two parts - one to pass from an unfolded protein state to a native-like state by overcoming a free energy barrier that separates these states, and the other to explore the native-like states until the native state is attained .
After revision:  Each MD trajectory was divided into two parts - one to pass from an unfolded protein state to a native-like state by overcoming a free energy barrier that separates these states, and the other to explore the native-like states affects the folding kinetics .