Imprecise excision of the P{EPgy2}EY07120 insertion, resulting in a 4957bp deletion that extends from the site of the original insertion into the body of the Set2 gene.
Set21 homozygotes rarely reach the adult pharate stage; the adult pharate obtained does not show visible homeotic transformations.
Hemizygous males die as late third instar larvae.
Homozygous eyes (induced using the GMR-hid system in heterozygous females) are smaller in size and rough compared to wild-type eyes.
Set21 is rescued by Set2+t10.3