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PURPOSE: To explore the effect and mechanism of 17α-estradiol (17α-E2) on oxygen-induced retinopathy (OIR) in a murine model.METHODS: Newborn mice exposed to hyperoxia (75%±2%) underwent subcutaneous injections of different doses of 17α-E2 from postnatal day (P) 7 to 17.Retinal flat mounts were scored for avascular/total retinal area on P17.