using microscopic immunodiffusion assays and microdensitometric analysis of pericellular immunoprecipitate , the percentage of nucleated erythrocytes containing fetal hemoglobin ( fnrbc ) and the mean picograms of fetal or adult hemoglobin per nucleated erythrocyte ( picograms hbf/nrbc , picograms hba/nrbc ) were assayed in 14-d-old colonies ( bursts ) derived from peripheral blood erythroid progenitors .
C0019046
hemoglobin
C0015936
hbf