Columbia Engineers Grow Functional Human Cartilage in Lab (image) Columbia University School of Engineering and Applied Science Share Print E-Mail Caption This is a full section of a tissue construct with cartilage at the top and bone substrate underneath. The blue stain marks proteoglycan, one of the two key components of cartilage, and red marks the nuclei of the cells. Credit Photo by Sarindr Bhumiratana//Columbia Engineering Usage Restrictions None Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.