Analysis of patterning defects observed in retinae dissected at 41 h APF. The OMS (boxed in red) is the mean of the total number of defects observed per ommatidium. These defects include (a) errors in the arrangement of cone cells (number of cone cell defects; cone cells are pseudo-colored green in examples); aberrant (b) number, (c) size, and (d) junctional integrity of 1° cells (number of 1° cell defects; 1° cells are pseudo-colored blue in examples); (e) errors in ommatidial rotation (see examples in Fig. 1 M); (f) incorrect number or position of bristles (note bristle misplacement in Fig. 1 L); (g) errors in the number or specification of 3° cells; and number of (h) additional IPCs (pseudo-colored green) or (i) missing IPCs (see Fig. 1 L). The total number of IPCs per ommatidium is also given separately for each genotype analyzed. Since the number of rotation errors (0.1 per hexagon; n = 1,310), bristle errors (∼1.5 per hexagon), and 3° cell errors (∼2.4 per hexagon) observed in GMR>cindr-IR2 retinae were unmodified in all genetic interactions, these values are not shown separately. Bars, 10 μm.