Lymphocyte function in the cellular immune system features both afferent (receptor) and efferent (effector) components.
细胞免疫系统的传入(受体)和传出(效应器)功能都受到淋巴细胞功能的影响。
Natural killer (NK) cells are an important component of the innate cellular immune system which provide a first line of defence against viral infections.