TERT and hydrops fetalis: X-ray irradiation-induced oxidative stress in both cell lines, but with some dissimilarities (Figure 2A): in normal cells, OS increased after 48 h, reaching its maximum level at 72 h and subsequently decreasing up to 168 h since X-rays exposure; on the contrary, in HF-TERT cells we can note a statistically significant increase in OS only 72 h after treatment that went down immediately after 96 h.