No sign of primary tracheal branching is seen in btlΔOh10 embryos.
Elongated tracheal sacs from which hardly any primary branches grow are seen in homozygous embryos.
btl[+]/btlΔOh10 is an enhancer of dorsal group tracheal branch precursor phenotype of Rac1J11, Rac2Δ/Rac2[+]
btl[+]/btlΔOh10 is an enhancer of tracheal branch primordium phenotype of Rac1J11, Rac2Δ/Rac2[+]
btl[+]/btlΔOh10 is an enhancer of tracheal dorsal trunk primordium phenotype of Rac1J11, Rac2Δ/Rac2[+]