KENNETH EWARD / BIOGRAFX / SCIENCE PHOTO LIBRARY KENNETH EWARD / BIOGRAFX / SCIENCE PHOTO LIBRARY
Human growth hormone (GH), a substance produced in the pituitary gland and needed for growth throughout childhood and adolescence. In this image, produced from x-ray crystallographic data, GH (orange ribbons in foreground) is shown bound to its receptor (dark brown ribbons in background). A disulfide bond, formed by two cysteine amino acids (spheres) is shown in foreground. Disulfide bonds crosslink and stabilize the internal structure of proteins.
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