ETS1 and metastatic melanoma: The sequence from −555 to +1 nt (containing −203 and −407 ETS-1 BS, named BS1 and BS2, respectively), as well as the shorter fragment from −400 to +1 nt (only containing −203 ETS-1 BS1) were cloned in a promoter-less pGL vector and cotransfected with empty or ETS-1-containing vectors at first in the highly transfectable 293FT cells (Figure S2) and then in Me1007 and A375M, as representative primary and metastatic melanoma cell lines (see Figure 4B).