UASt regulatory sequences drive expression of the Hsap\TMEM208 open reading frame, mutated to carry the L27P amino acid replacement, a variant identified in a patent with global developmental delay and a multisystemic disorder. The coding sequence is tagged at the C-terminal end with three copies of Tag:HA. The human ORF is flanked by a pair of incompatible FRT sites (FRT5 and FRT2), which allows for future in vivo exchange of either the promoter or tag sequence.