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.
Adults with alcunspecified homozygous eyes and antennae (inducing homozygous somatic clones in the eye and antenna with Scer\GAL4ey.PH; Scer\FLP1Scer\UAS.cDa and killing non-mutant cells in the eye with WGMR.PG) accumulate a 'horn' of semi-transparent material on their antennae as they age. Their heads look otherwise normal externally - apart from occasional bristle loss.