loss of function allele
Nucleotides 2515-2527 are deleted, which results in the loss of the C-terminal 256 amino acid residues.
presumptive embryonic/larval tracheal system
In btl469 embryos, all tracheal branches fail to migrate.
In btl469/+, kni6/+ embryos, most primary tracheal branches fail to migrate.
btl1928
btl95
btlLG19