TP53 and cancer: Using a novel dual‐color fluorescence microscopy screen based on the colocalization of red fluorescent protein (RFP)‐tagged miR constructs with a green fluorescent protein (GFP)‐tagged 3′UTR region of p53, the microRNA miR‐19b was found to target p53 in multiple cancer cell lines (i.e., HeLa, MCF7, and HuH).