ALFRED PASIEKA / SCIENCE PHOTO LIBRARY ALFRED PASIEKA / SCIENCE PHOTO LIBRARY
Phenylalanine. Polarised light micrograph of crystals of phenylalanine. This is one of the essential amino acids, those which the body cannot synthesise and must be taken from food. It is often seen in dietary supplements. Good sources include eggs and dairy products. Magnification x35 at 6x7cm size.
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