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Histology of the MBT tumor injected intratumorally with blank polymer. (a) Magnification ×20; (b) magnification ×40, enlargement of the blank polymer and the surrounding mild inflammation area; bar: 0.1 mm; the polymeric formulation is assigned with the star (∗), the necrotic tissue with the white circle (⚪), the infiltration of the inflammation cells with a black circle (•), and the intact tumor cells with a black rhomb (♦).
