A study of basophil and TSLP responses during HD Tm infection has characterised distinct contributions by alarmins to circulating granulocyte makeup, with TSLP promoting basophilia; IL‐25, mastocytosis; and IL‐33, eosinophilia [39], suggesting differing effects on the bone marrow and the posture of the immune system. The gene discussed is TSLP; the disease is mastocytosis.