figure18

Fig 1-18. Main controls of the principal biologic variables of the human thyrocyte. EGF, epidermal growth factor; FGF, fibroblast growth factor; GH, growth hormone; HGF, hepatocyte growth factor; I – , iodide; IGF-I, insulin-like growth factor; IFN, interferon; IL-1, interleukin-1; TGF  , tumor growth factor-  ; TNF, tumor necrosis factor; TSAb, thyroid-stimulating immunoglobulins; positive control (stimulation);  + : negative control (inhibition)  .