Expression of LCBP1Scer\UAS.T:Avic\GFP-EGFP in the trachea, under the control of Scer\GAL4btl.PS, results in distortion of the filamentous texture and a reduction in the staining intensity of the chitin cable. This is greater than that observed when LCBP1Scer\UAS.D is expressed. The tube-overgrowth and -winding phenotypes in the tracheal branches are proportional to the severity of the intraluminal matrix defect.