Abstract: The present invention provides a method of creating a chemically-induced heterodimerizing system having three different components that form a ternary complex by amendment of a chemically induced homodimerizing system, wherein said chemically induced homodimerizing system comprises two components for the homodimerization, wherein the antigen binding domain comprising SEQ ID NO:1 (AB0) is the first component and a small molecule such as caffeine is the second component of the homodimerization, and wherein said AB0 and said small molecule form a complex of AB0/AB0/small molecule. Heterodimerizing systems obtained by said method are also disclosed herein.

Abstract: Disclosed is a group of chimeric antigen receptors (CARs) having two, three or four CAR molecules, wherein each member of the group of CARs is different in its amino acid sequence from one another, and wherein each of the CAR molecules of the group include at least a transmembrane domain and an ectodomain, wherein the ectodomain has one or two antigen binding moieties and/or one or two binding sites to which other polypeptides each including at least an antigen binding moiety are able to bind; wherein the ectodomain of each CAR molecule of the group in its prevalent conformation is free of cysteine amino acid moieties which are able to form intermolecular disulphide bonds with other CAR molecules of the group, respectively, and wherein each CAR molecule of the group includes at least one heterodimerization domain.

Abstract: A group of chimeric antigen receptors (CARs) having two, three or four CAR molecules, wherein the members of the group of CARs can be different in their amino acid sequences, and wherein each of the CAR molecules of the group includes at least a transmembrane domain and an ectodomain comprising either an antigen binding moiety or a binding site to which another polypeptide is able to bind, wherein the polypeptide comprises an antigen binding moiety; wherein each CAR molecule of the group includes at least one dimerization domain, wherein this dimerization of a pair of dimerization domains is either induced by a regulating molecule and optionally reduced by another regulating molecule, or occurs in the absence of a regulating molecule and is reduced by a regulating molecule, and wherein the antigen binding moieties of the CAR molecules of the group specific for one target antigen.