frh-1::
gfp3, which does not contain the
frh-1 gene but contains all the 5 sequence present in
frh-1::
gfp1, was not expressed in amphid neurons, suggesting the presence of a regulatory sequence within the
frh-1 gene that would drive the expression of the gene in head neurons. On the other hand, the
frh-1::
gfp3 was expressed in the pharynx, gut cells, spermatheca, and body wall muscles, as the
frh-1::
gfp1, indicating that
frh-1::
gfp1 would contain most of the necessary sequences for frataxin expression.