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Fluorescence micrograph showing a coronal section of the proboscis (an elongated tubular feeding and sucking organ at the head of the insect) of the adult fruit fly, Drosophila melanogaster. Muscles are visible in orange (stain with antibodies anti-actin) and nuclei are in blue (stain with Hoechst). Green is an artifact staining. The image shows that the opening of the fly's digestive tract is covered with protective hook-like projections; mag.30x (at 13 x 17 in.)