The basal expression of the ferritin-1 gene was so low that it was difficult to determine the basal distribution of gene expression. Phosphine treatment of the nematodes revealed a dramatic increase in ferritin-1 transcript expression, whereas a similar signal intensity was not observed in the air-treated control nematodes. The distribution of ferritin-1 gene expression following induction by phosphine closely resembled the distribution of ferritin-2 gene expression. (see Expr4745)