Becoming Bone (IMAGE) Brown University Caption A population of fat-derived stem cells expresses the bone-specific COL1A1 gene. Green fluorescence from a “molecular beacon” shows increasing expression from day nine, left, through day 11 and day 14. By day 16, right, expression begins to wane. Credit Darling Lab/Brown University Usage Restrictions Credit required License Licensed content 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.