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.
Fusion-competent myoblasts are clustered around founder cells, with filopodia extending towards them, in stage 13 mutant embryos, even though the fusion process is arrested in these embryos.