MICHAEL ROSS / SCIENCE PHOTO LIBRARY MICHAEL ROSS / SCIENCE PHOTO LIBRARY
Light micrograph of a developing finger bone in a late foetus. This micrograph shows hypertrophying cartilage and mixed bone spicules within the marrow space. The spicules contain an inner core of calcified cartilage (stained pale blue) and bone tissue (stained dark blue) deposited against the calcified cartilage. Mallory-Azan stain. Magnification: x175.
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