The present invention relates to modified insulin analogs and blood glucose regulating proteins with improved activity profiles, methods of preparing these molecules, pharmaceutical formulations thereof, as well as their use in therapy. Further the invention relates to methods for inhibiting protease degradation in serum and/or increasing serum stability of a protein.本發明係關於具有經改良活性輪廓之改質胰島素類似物及血糖調控蛋白,製備此等分子之方法,其醫藥調配物,以及其等於治療上之用途。進一步,本發明係關於用於抑制血清中蛋白酶降解及/或增加蛋白質之血清穩定性之方法。