Has two temporally distinct modes of expression during early embryogenesis; expressed in seven stripes at the blastoderm stage, then during gastrulation the seven primary stripes are supplemented by secondary stripes which appear in alternate segments. This results in the labelling of every segment in the extended germ band. Also expressed in the embryo in distinct regions of the gut, the Garland cells associated with the proventriculus, the pericardial cells, the lymph glands associated with the heart, in a subset of cells in the central nervous system and in select apodemes. Expressed in a segmentally repeated pattern in the leg disk at the distal edge of each presumptive leg segment except in tarsal segments 1 to 4.