BSF-2 is not just a differentiation factor.
D000818:Animals; D000944:Antigens, Differentiation, B-Lymphocyte; D000954:Antigens, Surface / Q000302:isolation & purification / Q000502:physiology*; D006133:Growth Substances / Q000302:isolation & purification; D007370:Interferon Type I / Q000502:physiology
D000944:Antigens, Differentiation, B-Lymphocyte; D000954:Antigens, Surface; D006133:Growth Substances; D007370:Interferon Type I