LRRC4 (Leucine Rich Repeat Containing 4): LRRC4 (Leucine Rich Repeat Containing 4) is a protein mainly expressed in the brain and involved in neural development. It plays a role in the formation and maintenance of the nervous system, as well as in neural cell adhesion and signaling. LRRC4 has been studied in connection with brain tumors, particularly gliomas, making it a key focus in neurobiology and cancer research.