  Pure and homogeneous biological macromolecules (i.e. proteins, nucleic acids,
protein-protein or protein-nucleic acid complexes, and functional assemblies
such as ribosomes and viruses) are the key for consistent and reliable
biochemical and biophysical measurements, as well as for reproducible
crystallizations, best crystal diffraction properties, and exploitable electron
microscopy images. Highlights: Pure and homogeneous macromolecules are the key
for the best experimental results; They warrant the consistency and the
reliability of biochemical and biophysical data; They give more reproducible
crystallography and electron microscopy results as well.
