Abstract
Characterization parameter for protein crystals has been discussed. I/CJ is not a proper parameter. The apparent B- factor obtained by the Wilson Plot is a good parameter for the characterization of protein crystals, and the modified Wilson Plot has been proposed for obtaining B-factors. This method has been applied to the characterization of oligomer DNA and Hen Egg-White Lysozyme crystals. The intrinsic nature of the good protein crystal has been explained not by the mosaic block model but by the degree of the molecular orientation in a unit cell.
