Sentence:  Although in both emotions sympathetic symptoms are present , different autonomic somatic patterns underlie aggression and anxiety , respectively , as indicated by the rate of the excretion of the <WSD>catecholamines</WSD> , the state of the muscle tone , and the Mecholyl test . 
Meaning of the word marked with <WSD> tags:  any of a group of chemicals including epinephrine and norepinephrine that are produced in the medulla of the adrenal gland