Each of the following hormones is an amino acid derivative, except Each of the following hormones is an amino acid derivative, except:

- melatonin.

- norepinephrine.

- epinephrine.

- thyroid hormone.

- thyroid-stimulating hormone.

Try to think those who are made from amino acid ... melatonina it is a tryptophan precursor, norepinephrine comes from tyrosine, epinephrine also comes from tyrosine and phenylalanine, the thyroid hormone comes from tyrosine too, but the TSH is derivated from TRH. Last option is not an amino acid derivative.