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Grade 1: Round or uniform nuclei, approx. 10 µm in diameter; nucleoli absent
Grade 2: Slightly irregular nuclear contours, approx. 15µm in diameter; nucleoli visible at 400x
Grade 3: Moderately to markedly irregular nuclear contours, approx. 20 µm in diameter; nucleoli visible at 100x
Grade 4: Nuclei similar to grade 3, but also with multilobular nuclei, multiple nuclei, and/ or bizarre nuclei
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