Styrud , J. ., Unger , E. . and Eriksson , U. J. . (1990) “Metabolism in Vitro of Cartilage Proteoglycans in Rat (Pre)chondrocytes from Different Embryonic Regions”, Upsala Journal of Medical Sciences, 95(1), pp. 31–44. doi: 10.3109/03009739009178574.