Abstract
Quantitative measurements of the X-ray diffraction pattern of dry porcupine quill tip are reported for both low- and high-angle regions. There is a considerable measure of agreement with the intensity transform calculated for the coiled-coil rope model proposed by Crick but precise comparison is handicapped by interference effects due to macromolecular organization. A method of allowing for these effects is devised for the equator and good agreement obtained with the observed pattern.
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