Yp1 5' sequence to -883 with respect to start of transcription is sufficient for directing female-specific expression.
Female-specific expression of Yp1 is retained with 883 bp of 5' sequence. Transcript is detected only in adults. Northern blots of RNA from hand-dissected female tissues shows expression to be present in fat bodies, as well as in in the head and thorax (the latter two tissues contain fat body cells).