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(A) Double and triple fluorescent immunocytochemistry for albumin/CK19 and CD44/HNF4α/albumin, respectively, was performed in second and third passage cells at 28 days after plating. Scale bars = 100 μm. (B) Transmission electron micrographs of second passage cells at 14 days after plating. Scale bars = 20 μm (B-1) and 5 μm (B-2).
