I am trying to create a construct consisting of the GnRH promoter region from a chicken and the SV40 large t-antigen (TAg) encoding region for my master's thesis (to later create an immortalized avian GnRH secreting cell line). I was having trouble trying to isolate the TAg and ran across one that is already ligated into a plasmid but I am unsure of what regions of the TAg it includes. Has anybody ever heard of this? Thanks!