Second, mice haploinsufficient for Foxf1 have abnormal alveolar development, notwithstanding the fact that the histological changes are not identical to those of ACD/MPV.18,19 We therefore sequenced FOXF1 in a cohort of 18 patients with ACD/MPV and other malformations.10 Here, FOXF1 is linked to granular corneal dystrophy type II.