Flow cytometric analysis of basophil numbers in chronic urticaria: basopenia is related to serum histamine releasing activity. - Grattan, C. E. H.; Walpole, D.; Francis, D. M.; Nllmi, N.; Dootson, G.; Edler, S.; Corbett, M. F.; Barr, R. M. (Clinical & Experimental Allergy, 1997)