80938-76-7 L-Arginine, N2-(1-(N2-(N-(N2-(1-(N2-L-threonyl-L-lysyl)-L-prolyl)-L-arginyl)-L-threonyl)-L-lysyl)-L-prolyl)- Thr-lys-pro-arg-thr-lys-pro-arg Threonyl-lysyl-prolyl-arginyl-threonyl-lysyl-prolyl-arginine Tuftsinyltuftsin