STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Black mustard seed. Coloured scanning electron micrograph (SEM) of a black mustard seed. This seed comes from the black mustard plant (Brassica nigra) and is used in crushed form as a culinary spice or oil. Magnification: x150 when printed 10 centimetres wide.
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