KRAS and anemia (phenotype): Rescue experiments identified partial functional overlap between KRAS and HRAS or NRAS (Nakamura et al., 2008) Further analysis of Kras-/- embryos revealed that they displayed features of anemia, fetal liver defect (decellularization) (Johnson et al., 1997), motor neuronal defect (cell death) and ventricular myocardium atrophy (Korea et al., 1997).