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A maize prolamin box (P-box)-binding factor (PBF-1) has been purified and characterized from immature endosperm tissue. PBF-1 has a molecular weight of 38kDa. It is detected only in endosperm, but not in root or leaf tissues, consistent with its tissue-specific function. Site-directed mutagenesis experiments reveal that both the P-box and its flanking sequences are important for PBF-1 DNA binding...
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