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Let your wry biochemical side shine when you wear this tee featuring 20 of the most common amino acids along with the caption "Not All Of Them Are Essential". An essential amino acid is one that cannot be synthesized by scratch from the organism; a conditionally essential amino acid is one that can have their synthesis severely limited under special pathophysiological conditions; a dispensable amino acid can be synthesized by the human body. Educational scientific attitude t-shirt featuring the chemical structure of 20 amino acids.