With various inhibitory concentrations sigmoidal inhibition curves were obtained. The inhibition constants, obtained from the curves,were 4.4(NaN 3), 3.2(PTU), 2.6(KSCN) and 1.8(NaF).

• Na N3 、PTU、KSCN和 Na F抑制 TPO活性 ；并且随着其浓度的升高 ；抑制作用增强 ；抑制常数分别为 4.；4；3