Peptide nucleic acid(PNA) is a nucleic acid analog in which the sugar phosphate backbone of natural nucleic acid has been replaced by a synthetic peptide,resulting in an achiral and uncharged mimic.

• 肽核酸是一核酸类似物,是核酸中的糖-磷酸主链被一合成的肽链所取代,最终形成一种非手性的、不带电荷的类似物。