Fig. 2From: Lung development and regeneration: newly defined cell types and progenitor statusCell lineages within the developing lung. The Nkx2-1-positive endoderm developed into both Sox2 positive proximal progenitors and Sox9 and Id2 double positive distal progenitors. The proximal and distal progenitors give rise to distinct sets of differentiated cells. Markers of each cell type are indicated in parenthesesBack to article page