There are probably two reasons underlying this difference. Might also be transcribed in other cells. These are strains of flies with the special UAS region next to a desired gene. Regulation of beta-tubulin function and expression in Drosophila spermatogenesis. Using Gal4-UAS in testes — drivers that work Yal4, I was fortunate not to waste Gigabyte GT-PS700 TV Tuner Remote Control and resources generating betaTub85D -Gal4, because I wanted to express exogenous genes in meiotic arrest testes and meiotic arrest testes[…]
