DR KEITH WHEELER / SCIENCE PHOTO LIBRARY DR KEITH WHEELER / SCIENCE PHOTO LIBRARY
Pig skin. Light micrograph of a section through skin from the snout of a pig (Sus sp.). The epidermis consists of a layer of dead keratinised cells (orange), which act as a protective barrier, and an inner layer living cells (dark red). Below this is the dermis, a layer of connective tissue (pink), blood vessels and hairs (dark purple and orange, two at left). Below this are layers of muscle (purple and red). Magnification: x6 when printed at 10 centimetres wide.
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