Human Bone Lamellae in 3D Orange on Black Background No Specs (image) New York University Share Print E-Mail Caption A 3-D microscopic view of bone from a human femur showing incremental growth lines corresponding to a biological rhythm that repeats itself every eight days. The black hole at the top is a blood vessel canal. Credit Dr. Tim Bromage 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.