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. . . . Sickle cell disease is a group of hemoglobin disorders in which the sickle ?-globin gene is inherited e.g. a- Homozygous sickle cell anaemia (HbSS): the most commonb- Double heterozygote HbSCc- Double heterozygote HbS ? thal.. Hemoglobin S: - Hb ?2 ?2S : Substitution of valine for glutamic acid in position 6 in the B chain. - Insoluble: when exposed to low O2 crystal formation..
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