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15 Jun 2012
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sem bird eye lens fibres.coloured scanning electron micrograph (sem) of a freeze-fracture of fibres from the lens of a bird eye. lens cells lack a nuclei, and the main constituent of the cells is the protein crystallin. tightly packed layers of lens fibres (as seen here) are referred to as laminae. the lens fibres are linked together via gap junctions (one seen here) and interdigitations of the cells. the transparency of the lens is thought to arise from the regular arrangement of these cells. .unlike mammalian eyes the birds lens has a soft cenyer and is more deformable..magnification: x2000 when printed at 10 centimetres wide. . eye lens. coloured scanning electron micrograph (sem) of cells from the lens (crystalline lens) of the eye. the cells are in a stacked linear, fibre-like arrangement. the transparency of the lens is thought to arise from this regular interlocking arrangement, as well as the absence of nuclei and the cells mainly containing the protein crystallin. the lens (found at the front of the eye) focuses light on to the light-sensitive cells in the retina at the back of the eye. magnification: x2000 when printed at 10 centimetres wide.


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