RHO and pulmonary artery enlargement: Intense rod cell immunolabeling was achieved with the antibody rhodopsin, and a significant 1.30-fold increase in PAE retinas was observed compared with controls (p = 0.031, n = 5 for control and PAE groups, U = 2, Mann–Whitney test; Fig. 3I,J) and this effect was not observed in the peripheral part of retina.