MICROSCAPE / SCIENCE PHOTO LIBRARY MICROSCAPE / SCIENCE PHOTO LIBRARY
Polarized light microscopy of ovoid and circular osteons of adult human bone. This is an unstained ground slice of bone about 50 micrometers thick. The concentric circles represent layers of bone matrix that appear as alternate white and dark rings due to the respective oblique or parallel orientations of mineralized collagen fibres. Magnification x70 when narrow width printed at 10 cm.
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