Genomic fragment including the psq gene, from BAC clone CH321-61B16. A sfGFP-Tag:FLAG-Tag:CS(PSP)-Tag:CS(TEVp)-Tag:BLRP tag cassette has been introduced at the C-terminal end of the psq gene, such that protein isoforms A, B, C, D, E, F, G, H, I, J, K and L are tagged.