Abstract
Demineralized sections of normal and pathological cartilage from various sources, were soaked in a weak solution of Ca45Cl2 and coated with fluid photographic emulsion. The autoradiographic record showed an apparently specific pattern of Ca45 intake. Comparisons of these images and those obtained with S35O4 in vivo and also the negativating effect of hyaluronidase seems to indicate a relationship between Ca45 intake and the relative local distribution of sulfated mucopolysaccharides in the tissue.