PTEN and infection: To investigate whether Dicer1 knockout caused the epithelialization of the mouse fallopian tube stromal cells and affected the growth of the Dicer-Pten DKO cancer cells, a FLAG-tagged Dicer1-expression construct was introduced into both FTdT172 and FTdT967 cells by lentiviral infection and the resulting cells were tested for FLAG-Dicer1 expression (Figure 4A) and cell growth and epithelial phenotypes.