A group of cells releases a factor, which changes gene expression in a related group of cells. (discovermagazine.com)
The opiate - like peptide beta - endorphin and adrenocorticotropin are concomitantly secreted in increased amounts by the adenohypophysis in response to acute stress or long - term adrenalectomy as well as in vitro in response to purified corticotropin releasing factor and other secretagogues. (science.sciencemag.org)
Two analogs of the hypothalamic luteinizing hormone releasing factor modified at the histidine - 2 position were tested for biological activity (secretion of luteinizing hormone) in cultures of dispersed rat anterior pituitary cells. (science.sciencemag.org)