"To examine the expression pattern of
fre-1, we amplified the 1.8 kbp 5' to the
dcs-1 open reading frame, the entire
dcs-1 coding region, and the first 38 coding bp of
fre-1 and cloned this construct in-frame with GFP. Examination of transgenic animals carrying this construct showed GFP expression throughout development in the nuclei of neurons and the pharyngeal muscle, with heat shock enhancing GFP expression (Fig. 4A). RT-PCR analysis of
dcs-1 and
fre-1 indicates that both mRNAs are expressed in all developmental stages, that L3 and adults have higher expression levels, and that both messages are present in dauer animals and similarly induced by heat shock (Fig. 4B)."