Next, we sought to corroborate this finding in 2 murine BCC cell lines: ASZ (p53-positive) and BSZ (p53-negative).7 First, using IF and WB (p <0.001 in both cases), we confirmed that p53 was expressed only in ASZ cells (Fig 2A and Fig 2B). The gene discussed is TP53; the disease is skin basal cell carcinoma.