On the cover: Light micrograph of a section through the human pancreas. The central purple islets of Langerhans are hormone-secreting and form the endocrine (secreting directly into the blood) part of the pancreas. The surrounding exocrine (secreting into the gut via ducts) tissue produces digestive enzymes. Magnification: ×200 when printed at 10 cm wide. Credit: Steve Gschmeissner/Science Source. For further information, please visit www.sciencesource.com


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