271D

STRUCTURAL STUDIES ON NUCLEIC ACIDS

Entity

Entity ID	Chain ID	Description	Type	Chain length	Formula weight	Number of molecules	DB Name (Accession)	Biological source	Descriptive keywords
1	A, B (A, B)	DNA (5'-D(*CP*GP*CP*GP*AP*AP*UP*UP*CP*GP*CP*G)-3')	polymer	12	3635.3	2
2	C (A)	MAGNESIUM ION	non-polymer		24.3	1	Chemie (MG)
3	D, E (A, B)	water	water		18.0	125	Chemie (HOH)

Contents of the asymmetric unit

Polymers	Number of chains	2
	Total formula weight	7270.7
Non-Polymers*	Number of molecules	1
	Total formula weight	24.3
All*	Total formula weight	7295.0

*Water molecules are not included.