hormone monoamine hormone 2012-10-15T04:51:18Z A chemical substance consisting of an amine compound which contains one amino group and was derived from an aromatic amino acid, that in its endogenous state is produced in one part or organ of the body and initiates or regulates the activity of an organ or a group of cells in another part of the body. XCO:0000230 experimental_condition_ontology jsmith