title: Rat plasma and hypothalamic beta-endorphin levels fluctuate concomitantly with plasma corticosteroids during the day.
mesh_terms: D000305:Adrenal Cortex Hormones / Q000097:blood*; D000818:Animals; D002940:Circadian Rhythm; D004723:Endorphins / Q000097:blood / Q000378:metabolism*; D007031:Hypothalamus / Q000378:metabolism*; D008297:Male; D010870:Pineal Gland / Q000378:metabolism; D010902:Pituitary Gland / Q000378:metabolism; D051381:Rats; D011919:Rats, Inbred Strains; D001615:beta-Endorphin
chemical_list: D000305:Adrenal Cortex Hormones; D004723:Endorphins; D001615:beta-Endorphin