Expression of reporter genes in larval tracheal cells. The label above each panel identifies the reporter gene.
Some panels have multiple examples.
Tracheal cells create and encompass a hollow tube used for gas exchange. In some photos the tube has partially filled with air which causes it to be a dark brown. Arrowheads serve to identify tracheal cells. This indicates that restoration of the 55 and 20 boxes but not the 4E region are sufficient to restore expression to the EX deletion. P6, Gal4BII and Gal4B2.1 show the same tracheal cell expression pattern indicating that tracheal expression is not dependent on the intronic region.