| http://www.w3.org/ns/prov#value | - noun L???tryp??to??phan \??el-??trip-t??-??fan\Definition of L-TRYPTOPHAN : the levorotatory form of tryptophan that is a precursor of serotonin and was used formerly as a dietary supplement especially to promote sleep and relieve depression First Known Use of L-TRYPTOPHAN1949
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