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.
msn- clones in pupal wings reveal defects in prehair initiation. Loss of msn activity affects wing hair actin organisation, since adherens junction actin in msn- clones appears normal. In some mutant cells an actin "hair" is detected in the pupal wing, often at abnormal positions within the cell. The adult hairs are either missing, branched or stunted. Some cells that generate stunted hairs initiate them at multiple sites.