... the anteroposterior (AP) axis of the fat body, with patterns parallel to those previously characterized for the larval and adult epidermis. As fat body nuclei have polytene chromosomes, we were able to identify the BX-C locus and show that it assumes a strongly puffed conformation in cells actively expressing...

... complex ( Zink and Paro, 1989 ). The signal at each of these sites could represent the interaction of Pc at a single or at several regulatory sequences. DNA fragments from the BX-C can be individually tested by the chromosome binding assay if the fragments are carried on P-element insertions at other...

.... By using the Pc 3 mutation and various BX-C mutant combinations, we have generated clones of imaginal cells possessing different combinations of active homeotic genes. We find that, in the absence of BX-C genes, Pc − clones develop prothoracic patterns; this is probably due to the activity of Sex combs...