TP53 and neoplasm: Using a zebrafish transgenic melanoma model, we have previously shown that in a cancerized field of melanocytes carrying driving oncogenic mutations, such as BRAFV600E and loss of tp53, only a few cells or subclones will go on to develop a malignant tumor, and that this event is marked by re-expression of developmental neural crest (NC)markers sox10 and crestin (Kaufman et al., 2016; McConnell et al., 2019).