1 1 vote Which of the following chemical messenger(s) is/are derivative(s) of tryptophan? $\gamma$-amino butyric acid Indole acetic acid Melatonin Serotonin Biochemistry gatebt-2021 multiple-selects biochemistry molecular-biology-and-genetics + – go_editor 1.4k points answer comment Share Follow 0 reply Please log in or register to add a comment.