exu regulatory from -1025 to -291bp upstream of the translation start codon (drives expression exclusively in the male germline) are fused upstream of TEVp that is tagged at the N-terminal end with Tag:NLS(SV40-largeT) and Tag:V5 and at the C-terminal end with two copies of Tag:NLS(SV40-largeT). 1216bp of exu 3' regulatory sequences are present downstream of the coding sequence.