EcoRI-SalI fragment contains the fs(1)Ya and fs(1)Yb transcription units, and rescues fs(1)Ya2 but not fs(1)Yb1. fs(1)Ya+7.7 is the same construct as fs(1)Ybt7.7 Position of mutation on reference sequence inferred by FlyBase curator based on author statement.
fs(1)Ya+t7.7 rescues fs(1)Ya2