Imaginal disc expression resembles and is broader than that of bi, but the embryonic pattern is different. See Figure 1 in FBrf0152374 for images of expression patterns.
abnormal planar polarity, with fjUAS.cZa
abnormal planar polarity, with ftUASp.cSa
lethal - all die during embryonic stage, with Rcom\RTA.UAS
some die during embryonic stage, with Rcom\RTA.UAS
ommatidium, with fjUAS.cZa
ommatidium, with ftUASp.cSa