Answer: kinins

AnswerCrossword Clue
kininsKININ, a hormone (a secretion of the endocrine organs)
kininsany of a class of plant hormones, produced by the roots and traveling upward through the xylem, that promote tissue growth and budding and, on application, retard plant senescence
kininsany of a group of hormones, formed in body tissues, that cause dilation of blood vessels and influence capillary permeability