UASt regulates expression of amino acids 1-657, corresponding to Lasp-PB, but with the SH3 domain deleted (a stop at D507), and tagged at the N-terminus with Tag:FLAG and Tag:polyHis.
Scer\GAL4Mef2.PR-mediated expression of LaspΔSH3.L.Scer\UAS.T:Zzzz\FLAG,T:Zzzz\His6 cannot rescue the sarcomere length, thin filament length, myofibril diameter or flight phenotypes seen in Lasp1 mutants.