The expression levels of human RAR alpha ( hRAR alpha , receptor for all-trans RA ) and the human retinoid-X receptor alpha ( hRXR alpha receptor for 9-cis RA ) were determined by Northern blot analysis .
the expression levels of human rar alpha ( hrar alpha , receptor for all-trans ra ) and the human retinoid-x receptor alpha ( hrxr alpha receptor for 9-cis ra ) were determined by northern blot analysis .
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