ALFRED PASIEKA / SCIENCE PHOTO LIBRARY ALFRED PASIEKA / SCIENCE PHOTO LIBRARY
Polarised light micrograph of crystals of Vitamin H, d-Biotin. Vitamin H is found in yeast and some seeds, and is used by the body to break down pyruvic acid and oxaloacetic acid. Vitamin H deficiency may manifest itself as dermatitis, lassitude and a loss of appetite. Magnification x23 at 6x7cm and x40 at 4"x5" size.
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