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FIGURE 10.4. Hemoglobin fingerprint. Fingerprints made by o combination of 

 electrophoresis and chromatogrophy. (a) and (b) are photographs of normal hemo- 

 globin (HbA) and sickle-cell hemoglobin (HbS) respectively, (c) and (d) are tracings 

 in which the difference in pattern of spots is indicated by cross-hatching (after Ingram, 

 1958, Scientific American, January, p. 68). 

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