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'receptors': [22, 25], '(RAR)/retinoid': [23], 'X': [24], '(RXRs)': [26], 'heterodimers': [27], 'to': [28, 61], 'induce': [29], 'the': [30, 66, 84, 89, 107], 'expression': [31], 'of': [32, 57, 68, 83, 94, 106, 109], 'genes': [33], 'that': [34, 87], 'control': [35, 88], 'cell': [36], 'fate': [37], 'specification,': [38], 'proliferation,': [39], 'differentiation.': [41], 'Alterations': [42], 'levels': [46, 56], 'are': [47], 'often': [48], 'associated': [49], 'with': [50], 'congenital': [51], 'defects.': [53], 'Therefore,': [54], 'embryonic': [55], 'need': [60], 'be': [62], 'carefully': [63], 'regulated': [64], 'through': [65], 'activity': [67], 'enzymes,': [69], 'binding': [70], 'proteins': [71], 'transporters': [73], 'involved': [74], 'metabolism.': [78], 'Here,': [79], 'we': [80, 102], 'review': [81], 'evidence': [82, 105], 'complex': [85], 'mechanisms': [86], 'fetal': [90], 'uptake': [91], 'synthesis': [93], 'from': [97], 'precursors.': [100], 'Next,': [101], 'highlight': [103], 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