Figure 2.

Proximity of macrophages and myofibroblasts in the septum of the heart from a 20-week fetus with congenital heart block (CHB). Longitudinal sections through the septum of a 20-week CHB heart. Tissue was first incubated with (A) anti-CD68 (macrophage) or (B) anti-smooth muscle actin (myofibroblast and blood vessel smooth muscle cells), and then stained with alkaline phosphatase.

Buyon and Clancy Arthritis Res Ther 2003 5:266-270   doi:10.1186/ar763