(A) Different stages of erythroid cell differentiation, enucleation, and erythrocyte formation. The triangular shapes indicate the relative level of expression of Tmod1 and Tmod3 during erythroid differentiation. The horizontal brackets indicate where Tmdo1 and Tmod3, respectively, might play a major role during erythropoiesis. (B) In erythroid islands, the potential role of macrophages and Tmod3 in support of the program that coordinates cell-cycle exit with enucleation in erythroid cells.