Fish faced with stressful stimuli launch an endocrine stress response through activation of the hypothalamic - pituitary - interrenal (HPI --RRB- axis to release cortisol into the blood. (sciencedaily.com)
In 2002, she identified another four genes that promote social feeding and which are found on neurons responding to stressful stimuli such as pain and noxious chemicals. (kavliprize.org)