Abstract
Nine individuals with Down's syndrome and 12 normal children were studied. Platelets from Down's syndrome (DS) were smaller than normal and had reduced numbers and volumes of electron dense bodies. Whole cell and dense body calcium levels were lower than normal, while platelet surface net negative charge and anionic sites were found to be elevated in DS platelets. The findings suggest a calcium‐related membrane abnormality as one of the defects in DS platelets.
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