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(Serotonin is another neurotransmitter that is an indoleamine.) The amino acid tryptophan (found in meats, dairy, and some grains) is converted by the enzyme tryptophan-5-hydroxylase to form 5-hydroxytryptophan, which is then converted to 5-hydroxytryptamine (aka serotonin !)
Fatigue should not automatically be blamed on laziness, aging, or willpower
If you let it sit too long before reading the results, urine on the test can evaporate and make it look like you have two lines instead of just one
Standardized mean differences (SMD) below 0.1 indicates that the variable is distributed in balance between the two cohorts
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