CA6 and renal carcinoma: In Figure 3, from (a) to (d), the pyrosequencing of LINE1 element (Qiagen, Germany), a kidney carcinoma cell line is shown (CKA-CA6), followed by human embryonic kidney cells (HEK293), spontaneously immortalized human keratinocytes (HACAT), and primary in vitro cultures of normal human dermal fibroblasts (NHDF).