different between trytophan vs tryptophan

English

trytophan (uncountable)

From German Tryptophan, from Ancient Greek ????? (phaín?, “to appear”).

tryptophan (countable and uncountable, plural tryptophans)

(biochemistry) An essential amino acid having an indole side chain; it is present in many foods, especially chocolate, oats, bananas and milk; it is essential for normal growth and development and is the precursor of serotonin and niacin; any specific form of this compound, or any derivative of it.
- 1999, Matt Ridley, Genome, Harper Perennial 2004, p. 169:
  The quickest way to raise serotonin levels again is to send more tryptophan into the brain, because serotonin is made from tryptophan.

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