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Kernel density plots illustrating the distribution of hemoglobin concentrations among: (a) children with HbAA (n = 250), HbAS (n = 40), and Hb SS (n = 5) genotypes; and (b) among children with none (n = 190; α α/α α), one (n = 89; α–/α α), or two (n = 9; α–/α–) alpha-globin deletions.
