CSF2 and neurodegenerative disease: Members of a new class of immunomodulatory cytokines, fusokines, which are pairs of two cytokines fused together, e.g., GM-CSF fused to IL-2, IL-15, or IL-21, are used for immunotherapy [34]; GM-CSF fused to blood plasma transferrin is suitable for the treatment of neurodegenerative diseases [35] and fused to albumin is suitable for the immunotherapy of tuberculosis [36].