passages.id: split_5_test_1319_passage
passages.type: progene_text
passages.text: Addition of either 20 kDa or 22 kDa GH , at low or normal physiological concentrations ( 0 , 2 , 5 , 12.5 , 25 or 50 ng / ml ) induced a dose - dependent increase in GHR / GHBP expression .