Figure 2.

Noggin expression assessed by β-gal staining in bone marrow cell cultures. Bone marrow cells from adult noggin^+/– mice were cultured for either 1 week (a–c) or 2 weeks (d–f) and stained for β-gal alone (blue, a and d) or β-gal with either ALP (red, b and e) or NSE (black in c and f) to identify cell types in the culture. Yellow arrowheads indicate cells that costain with β-gal and ALP or β-gal and NSE.