Assertion: l tryptophan | /r/HasProperty | glenmullen
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text: But from a biological point of view, it appears that serotonin's defensive combative feature isn't generally required in the rest of the body because only around 1-5% of serotonin is found in the brain and equally little serotonin is made from L-tryptophan (Sjoerdsma, et al., 1956; Glenmullen, 2000; Richard, et al., 2009; Peat, March 2011).