UAS regulates expression of wild type Hsap\SPTLC1 in the context of a "UAS-scSPT" construct that encodes "single chain SPT" (scSPT) expressing the three human SPT subunits (encoded by Hsap\SPTLC2, Hsap\SPTSSA and Hsap\SPTLC1), tagged with Tag:HA.