STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Black mustard seeds. Coloured scanning electron micrograph (SEM) of black mustard seeds. These seeds come from the black mustard plant (Brassica nigra) and are used in crushed form as a culinary spice or oil. Magnification: x20 when printed 10 centimetres tall.
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