ATOH1 and Iron deficiency anemia: Furthermore, this study has been performed using ATH1 Affymetrix chips which to this date lack a number of genes including important iron homeostasis-related genes such as FIT and FRO2. It can be speculated that fit1-1 plants display a rather intermediate reaction to iron deficiency due to their residual FIT expression and that not all FIT-dependent genes could have been detected due to the use of ATH1 Affymetrix chips.