The distal breakpoint of Df(2R)P34 does not impinge on the rib coding region, but rib transcripts are not expressed in Df(2R)P34 embryos, indicating that the deficiency must remove essential regulatory elements of rib.
lethal (with ribP16)
A small number of ribP16/ribP34 (2.2% of expected) escapers survive to adulthood.