Iron accumulation in ActR2a^−/−;Bmpr2^fl/fl;Alb-Cre mice. Livers (A-B) and spleens (C-D) from ActR2a^+/+;Bmpr2^fl/fl (A,C) and ActR2a^−/−;Bmpr2^fl/fl;Alb-Cre (B,D) mice were fixed in formalin, paraffin embedded, sectioned, and stained with Prussian blue. Sections were prepared from at least 4 animals in each group, and representative photomicrographs are shown. Scale bars represent 100 µm.