HMGA2 and neoplasm: Immunohistochemistry for Hmga2, tdTomato, and the GFP fusion protein confirmed that Hmga2 expression in neoplastic cells in KP172CT;Hmga2CK/+ mice overlaps with GFP expression and that Hmga2 protein is absent from all tumours in KP172CT;Hmga2CK/CK mice (Fig. 1b).