Imprecise excision of the P{GS} element, resulting in a 576bp deletion starting from the P{GS} insertion site and extending through the 5' end of the second exon.
Homozygous adults have no obvious defects in morphology. MgstlE54/Df(1)mal3 and MgstlE54/Df(1)16-3-22 flies show a reduced life span at 30oC compared to control flies.