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A: Small "lymphocyte-like" cell, containing coarsely clumped nuclear chromatin, prominent nucleoli (N), and a high concentration of cytoplasmic ribosomes, some of which are arranged along short segments of endoplasmic reticulum (arrows). X 20,200. B: A large thymus lymphocyte with nuclear chromatin pattern and cytoplasmic organization identical to that of. X 15,000.
