Modified fusion proteins of transferrin and therapeutic proteins or peptides, preferably antibody variable regions, with increased serum half-life or serum stability are disclosed. Coplanar anode and cathode electrodes of one light-emitting device are mounted on a substrate so that heat generated from the light-emitting device can be effectively dissipated through the substrate. Dislocation defects do not significantly propagate laterally from the sidewall into the trench in the underlying gallium nitride layer, so that the lateral gallium nitride semiconductor layer is relatively defect free. The sentinel node can then be accessed with a cannula having an RF energy electrode on the distal end of the cannula which is activated during insertion of the cannula. The magazine has a metal-reinforced follower which extends the operational life of the magazine.