Breakpoint mutation.
Ubxpbx-1/Ubx101 has viable phenotype, suppressible by xen[+]/Asxxen-72-3
SoxNGA1192, Ubx[+]/Ubx101 has lethal phenotype
Heterozygosity for Asxxen-72-3 in a Ubxpbx-1/Ubx101 mutant background causes lethality at the third instar larval stage.
E.B. Lewis, 1947.