There have been numerous posts on this site related to neomycin resistance conferred by Hek293T's T-antigen cassette.
https://www.researchgate.net/post/HEK293_or_293T_for_stable_line_selections_with_Geneticin
https://www.researchgate.net/post/What_is_the_difference_between_Hek293_and_Hek293T_cell_lines
https://www.researchgate.net/post/Hek-293_stable_cell_line_problems2
Does anyone have any idea as to what the sequence of this selection marker/cassette is? I've been trying to source a paper, but I haven't had too much luck.