Objective To evaluate the effect of iodine-125 labeled intact flagellin(~(125)I-rFlic) and its fragment(~(125)IrFlicΔ180-400) in allograft acute rejection model on non-invasive monitoring allorejection. Methods The rFlic and rFlicΔ180-400 were labeled with iodine-125 with iodogen method,and label rate,stability and receptor binding activities were analyzed. After the allograft / isograft mice models were established,biodistribution,pharmacokinetics and phosphor-autoradiography imaging were detected on day 8...