Insertion of mdg3 transposable element in 6th exon of r, 155bp downstream of splice acceptor site of the fifth intron. mdg3 is inserted in opposite transcriptional orientation to r.
Oblique wing truncation.
Suppressed by mutations at su(Hw), where su(Hw) mutation behaves semidominantly. Temperature-dependent suppression reported by Cramer DIS 55:197 not observed.