A case report is presented of gray platelet syndrome in siblings. The absence of platelet alpha-granules in these patients was confirmed by electron microscopy and by analysis of the platelet protein profile using SDS-polyacrylamide gel electrophoresis. This was further confirmed by quantitation of individual alpha-granule protein constituents. The results in these two patients are compared with those of the four reported patients with this syndrome.
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Berndt et al. (1983) studied this question.
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