Excision of most of the more distal P-element present in y+s (only 15-17bp from each end of the P-element are retained).
Body colour: flies have wild-type pigmentation in the body cuticle and wing blade and in the thoracic, leg, wing and abdominal bristles.
y+s27 has phenotype, non-enhanceable by ph-pP1
The phenotype is unaffected by ph-pP1.