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Immunostaining for NOS proteins. eNOS immunostaining is present on vascular endothelial cells of nonpregnant (a) and pregnant (b) myometrium. eNOS is undetectable on muscle. There were no differences in immunostaining between nonpregnant and pregnant myometrium. iNOS immunostaining was absent in both nonpregnant (c) and pregnant (d) myometrium. Scale bars, 100 μm (a and b) and 130 μm (c and d).
