TP53 and pachyonychia congenita: Using the C4-2 and its RB1 or TP53-KD derivatives as references, we carried out FACS analysis of cell surface GD2 expression on a panel of 18 established human and murine PC cell lines, which included variants of commonly used PC cell lines and two immortal prostate epithelial cell lines (PHPV18 and PSV40).