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Schematic of GH or TSH cell turnover in the adult AL and the supply of CD9/SOX2-positive stem cells. CD9/SOX2-positive cells in the IL-side MCL migrate into the AL-side MCL and then into the AL parenchyma. GH cells are derived from CD9/SOX2-positive stem cells in the AL-side MCL and the AL parenchyma. TSH cells are derived from CD9/SOX2-positive stem cells in the AL parenchyma. RC, Rathke’s cleft.
