Fig. 7
Immunostaining for contractile protein markers, myosin heavy chain (a) and desmin (b), was analyzed by laser scanning cytometry in frozen sections of pulmonary artery from control and PPHN animals, following chronic exposure to U46619 added daily for 72 h in tissue culture in the absence of serum. Results expressed as integral intensity/mm2 area (*p < 0.01 compared to age-matched control)