HTR5A and diabetes mellitus: Thus, the lack of associations between the platelet 5HT and metabolic traits found in this study may be explained by the relatively homogeneous, normoglycemic, mainly normoweight women (with no family history of diabetes) selected for this survey or maybe by the fact that we were measuring the massive amount of platelet 5HT content which is, as previously mentioned, less representative of the bioactive pool than the free 5HT.