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Stem cells and polarity. (A): Polarized quiescent stem cell. Polarity can be intrinsically established inside the cell. (B): An adherent polarized stem cell. Stem cell polarity can be established or maintained and reinforced upon adhesion to the niche. (C): Migrating polarized stem cell. (D): Polarized stem cells on division can distribute proteins symmetrically or asymetrically.
