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Truck leaving Port of Oakland Upper and Lower PMT arrays during assembly Detection of Percc1 expressing cells (red) amongst the epithelial cells (green) of the intestinal villi in a mouse. The site of Simons Observatory in the Atacama Desert in Chile. (Credit: Copyright Debra Kellner/Simons Foundation) Photo - Different wall colors on Georgetown row houses. iStock photo Photo - Bok and Mayall telescopes at Kitt Peak