Insertion of "T2A-Gal4-STOP-3P3-RFP", containing the GAL4 coding sequence and a 3P3-RFP marker flanked by loxP sites, into Shmt in-frame. (Region X:5913046..5913199 (FB2018_02) has been replaced.) This results in GAL4 being expressed under the control of Shmt regulatory sequences, with the Shmt coding region intact.