Bispecific antibodies (BsAbs) are artificial antibodies which possess two distinct specificities. Thereby, it is able to recognize two different antigens or epitopes simultaneously. Taking advantage of this unique character, researchers use BsAbs to guide effectors to targets of interest for further cellular or physiological effects, such as triggering the contacts between immune cells and tumor cells by binding marker proteins on the surface of each cell type simultaneously. http://www.creativebiolabs.net/bispecific-antibody-fagments-bsab-fragments.htm