title: Variability of hormone concentrations and ratios in commercial sera used for tissue culture.
mesh_terms: D000818:Animals; D001769:Blood; D002417:Cattle; D003470:Culture Media; D046508:Culture Techniques; D004958:Estradiol / Q000097:blood*; D004970:Estrone / Q000097:blood*; D005333:Fetus / Q000032:analysis; D007328:Insulin / Q000097:blood*; D008722:Methods; D011374:Progesterone / Q000097:blood*; D011863:Radioimmunoassay; D013739:Testosterone / Q000097:blood*
chemical_list: D003470:Culture Media; D007328:Insulin; D004970:Estrone; D013739:Testosterone; D011374:Progesterone; D004958:Estradiol