Fig. 5. Erythroblast motion in Mlc2a^-/- mouse embryos. The motion of erythroblasts (green) within vessels of Mlc2a^-/- embryos was imaged at two frames/second. Images were taken at (A) 0, (B) 2.5, (C) 5, (D) 7.5, (E) 10, (F) 12.5 and (G) 15 seconds. The motion of individual erythroblasts, marked by colored dots in A-G, were tracked and these tracks are shown (H), illustrating that erythroblasts oscillate with as much retrograde motion as anterograde.