FlyBase curator comment: this entry is used to capture phenotypic information when the particular allele (or allele combination) used by the author could not be determined but the context of the experiment suggests that the phenotype being described is some kind of loss of function.
Tsp[+]/Tspunspecified is an enhancer of muscle attachment site phenotype of ifB2
Tsp[+]/Tspunspecified is an enhancer of muscle attachment site phenotype of mewM6
Hemizygous mewM6 mutant embryos that are also heterozygous for Tspunspecified develop a weak muscle detachment phenotype affecting a small number of longitudinal muscles.