Figure 7

Pulmonary arteriole from a 6-week-old hypoxemic infant. The relative medial muscle mass present at birth has been retained (Verhoeff’s and Van Gieson’s stains). From Naeye and Letts [20], Pediatrics 1962.
Pulmonary arteriole from a 6-week-old hypoxemic infant. The relative medial muscle mass present at birth has been retained (Verhoeff’s and Van Gieson’s stains). From Naeye and Letts [20], Pediatrics 1962.