ANTONIO ROMERO / SCIENCE PHOTO LIBRARY ANTONIO ROMERO / SCIENCE PHOTO LIBRARY
Insulin crystals. Polarized light micrograph of crystals of insulin. This polypeptide hormone is produced by the pancreas in mammals to aid the body in metabolising sugars. A lack of this hormone is a cause of diabetes. Field of view size: 0.15 x 0.22 millimetres.
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