In contrast to a moderate, but significant increase in the percentage of activated platelets (CD62 positivity) in HD patients vs. control (2.3%[14.6] vs.1.1%[7.8]; p < 0.05) no difference in monocyte platelet aggregates (MPA) for any of the monocyte subtypes was observed (Fig. 2B). This evidence concerns the gene SELP and Huntington disease.