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Formaline-fixed paraffin-embedded sections of representative Oral Squamous Cell Carcinoma tissues were stained with the antibodies against DDAH2 and DUSP1. (a) Negative immunostaining of DDAH2 in nuclei of the tumour cells. (b) Positive staining of DDAH2 was detected in nuclei of the tumour cells. (c) Negative cytoplasmic immunostaining of DUSP1 in the tumour cells. (d) Positive DUSP1 cytoplasmic staining was detected in the tumour cells.
