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Expression pattern of SOX9 and COL2A1 proteins in E16.5 embryo limbs determined by immunohistochemistry. A: The expression of SOX9 in untreated and ATRA-treated E16.5 embryo limbs (200× and 400× objective). B: The expression of COL2A1 in untreated and ATRA-treated E16.5 embryo limbs (100× and 200× objective).
