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DABA is also known as diaminobenzoic acid. DABA can react with all aldehydes of the form RCH(2)CHO, but deoxyribose is the predominant one in mammalian cells and essentially the only one in the acid or alcohol precipitates of aqueous extracts. Hence, no purification is required and RNA does not interfere. DABA has the high serum stability of the oligomers. for further study dab PNAs as new self-recognizing bio-inspired polymers, it will to be developed new nanomaterials in biotechnological and biomedical applications.