The rtp rescue fragment extends from 1965 bp upstream of the AUG to 780 bp downstream of the stop codon.
The increase in dark noise seen in whole-cell recordings of dissociated ommatidia from Df(3R)rtp1 homozygotes (in which the lethality caused by disruption of Mms19 has been rescued by P{Mms19.5.6}) is rescued by rtp+t3.7.