| Often later ommatidial cell fates cannot be specified, such as pigment cells that normally function to separate ommatidia into individual facets. |
| However, in some cases both cells adopted the R7 fate, resulting in an ommatidial cluster containing three R7 neurons. |
| In contrast, enhancers of the Tau rough eye phenotype further reduced the eye in size and produced increased ommatidial irregularity and fusion of the overlying lenses. |
| The distal staining ensheathed the pseudocone and showed tapering extensions toward the basement membrane at ommatidial periodicity, indicative of expression in pigment cells. |
| Section of a bnd clone viewed under light microscopy shows no recognizable photoreceptors or ommatidial organization in the mutant tissue. |
