Before revision:  Spontanous curvatures of both phosphatidylethanolamines and cholesterol were found to be one order of magnitude more negative than those of phosphatidylcholines, whose J0 is close to zero.
After revision:  Spontanous curvatures of both phosphatidylethanolamines and cholesterol were found to be at least a factor of two more negative than those of phosphatidylcholines, whose J0 is close to zero.