3,4 dihydroxyphenylethylene glycol 4 4 hydroxy 3 methoxyphenylethylene glycol 4 Animal 4 Castration 4 In Vitro 4 Methoxyhydroxyphenylglycol 4 Norepinephrine 4 Rats 4 Rats, Inbred Strains 4 acetylsalicylic acid 4 animal 4 animal experiment 4 article 4 castration 4 drug derivative 4 drug effect 4 drug metabolism 4 endocrine system 4 in vitro study 4 metabolism 4 noradrenalin 4 noradrenalin h 3 4 radioisotope 4 rat 4 rat strain 4 3,4 dihydroxymandelic acid 2 3,4-dihydroxymandelic acid 2 Alprostadil 2 Dinoprostone 2 Epididymis 2