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Figure 4 Platelet P-selectin expressions in vivo in wild-type (P^+/+) and P-selectin-deficient (P^–/–) mice (A and B). Ferric chloride (FeCl₃) application increased in vivo expressions of platelet P-selectin only in P^+/+ mice but not in P^–/– mice (C). Platelet P-selectin expressions in P^–/– mice were similar to those in the negative control (fluorescein isothiocyanate [FITC] immunoglobulin G [IgG]).