Germline clone analysis demonstrates cell lethality.
U2af509-21 is rescued by U2af50+t10
U2af509-21 is rescued by U2af50+tB12
U2af509-21 is rescued by U2af50+tS12
Mutant phenotype can be rescued by P-element mediated transformation of a 10kb U2af50 genomic fragment.
Schalet.