Provided herein antibodies, activatable antibodies (AAs), bispecific antibodies, and bispecific activatable antibodies (BAAs). Also provided herein are methods of making and methods of use of these antibodies, AAs, bispecific antibodies, and BAAs.在本文中所提供者係抗體、可活化之抗體(AA)、雙特異性抗體、及雙特異性可活化之抗體(BAA)。亦在本文中所提供者係這些抗體、AA、雙特異性抗體、和BAA之製造方法及使用方法。