Double heterozygosity for hemoglobin Camden (β131 Gln→Glu) and hemoglobin S in an American Negro.

. A hemoglobin variant with the slightly fast mobility associated with K hemoglobins was found, together with hemoglobin S, in an apparently healthy 3-year-old Negro girl from Washington, D.C. Her father had the same variant, along with hemoglobin A, and her mother had hemoglobins A + S. Respective proportions of hemoglobins K and S in the propositus were 66–34. The K variant now has been found to have the structural change GlnGlu at position β131 (βH9); therefore it apparently is identical to hemoglobin Camden reported in trait form in a Negro subject by Yates, Bellingham and Huehns (Nature 243: 467–468, 1973).