Some Comments on the Article:

Abstract
K. Muller et al report X-ray scattering and density experiments on human plasma low-density lipoprotein B performed at different solvent densities (i.e., contrast variation method). The interpretation of the experimental data lead those authors to question the use of that method and particularly the use of the characteristic scattering functions in the study of serum lipoproteins. The present paper shows that several aspects of their analysis are highly questionable and that the objections raised are unfounded.