Provided by the present disclosure are antibodies (e.g., scFvs) that include CDRs and human framework regions that confer useful properties upon the antibodies. In certain embodiments, such properties include thermostability (e.g., increased melting temperature), efficient binding to Staphylococcus aureus Protein A, or both. In certain aspects, the antibodies are internalizing antibodies that specifically bind to the tumor associated antigen EphA2.本發明提供諸多抗體(例如scFv),該等抗體包括可賦予該等抗體以適用之性質的CDR及人類構架區。在某些實施例中,此類性質包括熱穩定性(例如增高之解鏈溫度)、與金黃色葡萄球菌(Staphylococcus aureus)蛋白A之有效結合或兩者。在某些態樣中,該等抗體為可特異性結合腫瘤相關抗原EphA2之內在化抗體。