Tyrosine crystals. Polarized light micrograph of crystals of tyrosine, a non-essential (synthesised by the body) amino acid. Tyrosine is synthesized from another amino acid called phenylalanine. The body requires tyrosine for many functions. In particular, it is closely linked to nervous system function, metabolism and regulating mood. Field of view size: 0.30 x 0.45 millimetres.
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