After transfer of approximately the same number of goldfish cells (3.3 ± 0.9 × 105; n = 7), evidence of reconstitution became apparent at a later time point (Fig. 1B); nonetheless, in week 4 after transplantation, c-myb mutant recipients exhibited a reddish complexion (Fig. 1C), had lost their heart edema as a sign of reversal of anemia, and, as a consequence of improved tissue oxygenation, could swim much faster than their unmanipulated mutant siblings. This evidence concerns the gene MYB and anemia (phenotype).