KENNETH EWARD / BIOGRAFX / SCIENCE PHOTO LIBRARY KENNETH EWARD / BIOGRAFX / SCIENCE PHOTO LIBRARY
LIBRARY Trypsin and inhibitor. Molecular graphic of the digestive enzyme trypsin (blue) complexed with an inhibitor peptide (green). The yellow sphere is a calcium ion involved in the reaction. Coloured ribbons represent chains of the amino acids that make up these two proteins. Trypsin is made by the human pancreas and excreted into the small intestine, where it helps break down proteins during digestion. The enzyme is also widely used in biochemical and genetic research.
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