In our present zebrafish studies, however, a pancytopenia phenotype was observed in TERT-knockdown embryos following MO injections, which was rescued by following injection of a zTERT mutant (ΔTR-zTERT) lacking the TR domain, suggesting that the cytopenia is not due to direct inhibition of authentic telomerase activity itself. The gene discussed is TERT; the disease is Pancytopenia.