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Relative mRNA expression of ETA (A) and ETB (B) receptors in lung tissues obtained from sham, ovariectomized (OVX) rats implanted with subcutaneous pellets containing estrogen (OVX + E2), progesterone (OVX + P), their combination (OVX + E2 + P) or placebo pellets (OVX). Values represent fold change from sham levels. Data are means ± SE of 4–6 samples in each group. *P < 0.05 vs. sham. †P 0.05 vs. OVX.
