KLF4 and testicular germ cell tumor: Moreover, we confirmed that LTR5_Hs were preferentially bound by KLF4, NANOG, POU5F1, and TFAP2C in naïve ESCs, by TFAP2C in PGCLCs, and by SOX17 in a germ cell tumor cell line using publicly available ChIP-Seq datasets [29,46,47] (S6 Fig).