The following information accompanied stocks sent by Todd Laverty, UC Berkeley (3/00).
An insertion of P{w+mC=GMR-phyl} generated by the work described in Chang et al. Cell 1995 80(3):463--472, 1995 (FBrf0079934) is a lethal insertion on the third chromosome.
(Note that the visible marker is w+mC because the construct was made using pP{GMR}. See FBrf0079934.)