brmI21, twi1/twi[+] has embryonic/larval somatic muscle cell phenotype
akirinKG01343, brmI21/brm[+] has embryonic/larval somatic muscle cell phenotype
brmI21/+ results in disruption of the somatic muscle pattern when in double heterozygous combination with any of the following (% of stage 16 embryos with missing, misattached or duplicated muscles in at least 2 hemisegments is given in parentheses): akirinKG01343 (35%) or twi1 (23%).