F58E6.7 (
hrg-3) was upregulated >70-fold by low heme in the microarray. qRT-PCR revealed that worms grown in 1.5 or 4 mM heme increased the abundance of F58E6.7 mRNA by more than 900-fold and 400-fold, respectively, over what is found in worms grown in 20 mM heme.