A) Immunoblot analysis of platelet lysates from wild type (WT) and Unc13dJinx mice shows lack of Munc13-4 in the latter and similar levels of PDI and ERp57 (GAPDH loading control). B) Flow cytometry measurement of surface P-selectin (CD62P) and PDI in platelets under resting conditions or after stimulation with PAR4-AP in the presence/absence of ADP shows that P-selectin mobilization is significantly impaired in Unc13dJinx platelets but PDI mobilization is greater than WT. ADP significantly increased PDI mobilization as compared to WT or resting Unc13dJinx platelets (*P<0.05, *** P<0.001, one-way ANOVA, followed by Dunnett's test or two-way ANOVA, followed by Bonferroni's test, n=4).