BCL6, or B-cell lymphoma 6 protein, is a transcriptional repressor that plays a crucial role in the regulation of the immune system, particularly in the development and function of germinal center B cells. It is encoded by the BCL6 gene and is essential for the normal formation of germinal centers, which are structures within lymphoid tissues where B cells proliferate, differentiate, and mutate their antibody genes during an immune response.
