Before revision:  5) The exergonic and endergonic folding are distinguished through the comparison between theoretical and experimental rates for each protein and the ultrafast folding problem is viewed from the point of quantum folding theory  .
After revision:  5) The exergonic and endergonic folding are distinguished through the comparison between theoretical and experimental rates for each protein and the ultrafast folding problem is viewed from the point of quantum folding theory and a new folding speed limit is deduced from quantum uncertainty relation .