KRT13 and breast cancer: IF analysis of KRT13 + cells at ALI day 7 showed nearly no labeling in control BC-1-derived cultures in contrast to BC-2 controls, which had significantly higher percentage of KRT13 + cells (1.54 ± 0.47% and 0.39 ± 0.39% in BC-2 and BC-1, respectively), and higher levels of Krt13 expression shown by qRT-PCR (Figure 4A–C).