| http://www.w3.org/ns/prov#value | - In vitro studies show that retinoids, in particular 9-cis-RA, inhibit the growth of oestrogen receptor- (ER-) positive through blocking cell cycle [57], but not ER-negative human breast cancer cells [25, 58]; ER-negative cells have been demonstrated to express lower RAR-?? levels compared to their ER-positive matched cells [59] and they exhibit retinol-induced growth inhibition when transfected wi
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