The ubiquitous OpIE2 promoter (derived from the baculovirus Orgyia pseudotsugata multicapsid nuclear polyhedrosis virus) drives expression of Tn\neoR. The transcription unit includes the female-specific intron and splice sites from tra so that Tn\neoR protein (which confers resistance to geneticin) is only expressed in females.
The ubiquitous OpIE2 promoter (derived from the baculovirus Orgyia pseudotsugata multicapsid nuclear polyhedrosis virus) drives expression of Salo\pac. The transcription unit includes the male-specific intron and splice sites from dsx so that Salo\pac protein (which confers resistance to puromycin) is only expressed in males.