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The structure, synthesis, genetic transmission, clinical associations and distribution of the elongated alpha-chain haemoglobin variants has been described. The data indicate that the most likely molecular basis for these common abnormal haemoglobins is a single base substitution in the alpha-chain termination codon. Because these variants are produced inefficiently they give rise to the clinical picture of alpha-thalassaemia. When these findings are taken together with recent work regarding the molecular basis for other forms of alpha-thalassaemia it is possible to build up a fairly complete picture of the molecular pathology of the alpha-thalassaemias.
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Weatherall et al. (1975) studied this question.
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