Resting platelets were fixed immediately upon blood draw while Washed platelets were fixed after platelet isolation and repeated rounds of centrifugation. Paired P values: Resting versus Washed preparations, OCS = 0.23, CS = 0.21; Resting versus Washed Platelets = 0.12, Resting versus Washed preparations, α-granules = 0.20. The quantitative and qualitative trend is the same in all cases, i.e., expansion, Washed versus Resting platelet preparations. For each condition, the pooled blood from 6 mice, gender mixed, was used. N = 5 platelets quantified for each comparison.