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a Cross-sections of Pf-FTMs and Rf-FTMs (HE). The epidermis was generated using MET1, MET2, MET4 or SCC12b2 SCC cell lines. b Quantification of the ingrowth; the ingrowth is significantly higher in Rf-FTMs of MET1 (P < 0.005), MET2 (P < 0.0001) and SCC12b2 (P < 0.05); N = 3
