MX1 and melanoma: In contrast to the transient expression of human GFP-MxA in Huh7 hepatoma and Mich-2H6 melanoma cells which led to formation of cytoplasmic condensates of MxA (Fig. 1, left half), the transient expression of murine GFP-Mx1, as expected (29, 30, 31), led to formation of nuclear bodies in most cells (Fig. 1, right half).