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Cluster cells in mouse and human ACP do not express Ki67 or SOX9. Double immunofluorescent staining against β‐catenin (green) and the proliferative marker Ki67 or the transcription factor SOX9 (red). Reproduced with permission from PNAS (Gaston‐Massuet et al., PNAS USA 2011, vol. 108, number 28, pp 11482–11487).
