Specifically, in the platelets from SLE patients, the addition of TRAP increased the average fraction of P-selectin-positive platelets from 2.5% before to 33% after TRAP stimulation, while in control samples, the average fraction of platelets expressing P-selectin increased from 1.5% to 73% after TRAP stimulation. Here, CD40LG is linked to systemic lupus erythematosus.