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Induction of ERV element expression during the on-Matrigel culturing of BT cell lines. The induction of four ERV elements in BT-1, BT-C, and BT-K cells during 8 days on-Matrigel culturing. The data were normalized to the control and then averaged (mean ± SEM). The black bars, gray bars, and white bars represent the control, on-collagen gel, and on-Matrigel cultures, respectively. The asterisks indicate a significant difference compared with the control (P < 0.05).
