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Figure 1: Equal intensity and proportional staining of TTF-1 in tumor cells, formalin-fixed paraffin-embedded, ×400 (a), cell blocks fixed in formalin, ×400 (b), and cell blocks fixed in alcohol, ×400 (c)

Figure 1: Equal intensity and proportional staining of TTF-1 in tumor cells, formalin-fixed paraffin-embedded, ×400 (a), cell blocks fixed in formalin, ×400 (b), and cell blocks fixed in alcohol, ×400 (c)