50.9 MB (2.0 MB compressed)
4479 x 3969 pixels
37.8 x 33.5 cm ⏐ 14.9 x 13.2 in (300dpi)
STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Dog hair, coloured scanning electron micrograph (SEM). The outside of the hair, the cuticle, is covered in overlapping scales of dead cells containing the protein keratin. Found exclusively in mammals, hair is one of the defining characteristic of the mammalian class. Magnification: x100 when printed 10 centimetres wide.
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