Embryonic globin protein detection with dual color immunocytofluorescence staining. Samples were from 22-week-old fetus, term cord, and adult blood. Blood smears or cytospins were stained with MoAbs specific for ζ and ɛ globins conjugated with FITC and TR, respectively. (A) Fetal, (B) cord, and (C) adult erythrocytes. (D) Fetal, (E) cord, and (F) adult cultured erythroblasts.