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1 Department of Hematologic Research, Medical Research Institute, Michael
Reese Hospital, Chicago, Ill.
1. It could be demonstrated that of the three tested types of human hemoglobinN (normal adult), S (sickle cell) and F (fetal)only the reduced S compound shows tactoid and gel formation in sufficiently concentrated solutions.
These physico-chemical phenomena may be used for the qualitative identification
of S hemoglobin. 2. The alkali resistant hemoglobin fraction, present in sickle cell anemia
erythrocytes (but not in trait red cells), was concentrated in purified form. No
tactoid or gel formation could be elicited. Therefore, this alkali resistant pigment does not appear to be a variant of S hemoglobin. It seems probable that
sickle cell anemia erythrocytes contain two separate types of pathologic hemoglobin (S and F) which are not directly related to each other.
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