Effect of rhGM-CSF on the differentiation of CD34⁺/c-kit⁺/CD13⁺(A) and CD34⁺/c-kit⁺/CD13⁻(B) cells cultured in rhSCF/rhIL-3/rhIL-6 over 4 weeks. Results shown are the average of 3 experiments separately performed, using PB cells. (□), Monocytes; (▪), mast cells; (), neutrophils; (), basophils; (▥), eosinophils.