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Phase-contrast microscopy of PA cell lines. On in vitro cultivation, 8 cell lines (SNU-2466, SNU-2469, SNU-2485, SNU-2543, SNU-2564, SNU-2570, SNU-2608, and SNU-2617) grew as monolayer of substrate-adherent cells, and 2 cell lines (SNU-2491 and SNU-2571) formed floating and adherent aggregates. Most tumor cells displayed a polygonal shape and had round-to-oval nuclei with prominent single-to-double nucleoli.
