4.3kb genomic fragment including osk, with three copies of Tag:HA at position T140. Contains a deletion in the 3'UTR (Δ521-628, 'SL2a'). A transport and localization signal (TLS, 44 nucleotides) from the 3'UTR of fs(1)K10 replaced sequences 57-78 of the osk 3'UTR.