Severe hyperoxia increases eNOS expression in haemopoietic foci.

<p>A) Immunohistochemical detection of eNOS-positive haemopoietic cells (arrows) in neonatal rat livers exposed to moderate and severe hyperoxia. a) ambient air; b) 60% hyperoxia; c) 95% hyperoxia; d) negative control; scale bar: 50 µm, magnification 40x. B) Graphic representation of the percentages of eNOS-positive haemopoietic cells (±SD); densitometric analysis determined by direct visual counting of ten fields for each of three slides per sample. ** = p<0.01.