normal modes of vibration of dna in the low-frequency region ( 10-300 cm-1 interval ) have been identified from raman spectra of crystals of b-dna [ d ( cgcaaatttgcg ) ] , a-dna [ r ( gcg ) d ( cgc ) and d ( ccccgggg ) ] , and z-dna [ d ( cgcgcg ) and d ( cgcgtg ) ] .
C0012854
dna
C0043442
z-dna