les (Figure 5B5). Immunostaining of Elav in eye-discs revealed that overexpression of Notch-ICD results in fusion of ommatidia and defective ommatidial spacing (Figure 5B1?B4). Interestingly, co-expression of Notch-ICD and Importin-a3 using the same eyGAL4 driver results in a considerable enhancement of the adult eye phenotype with more frequent fusion of ommatidia and appearance of abnormally siz