3RBC

Bullfrog M ferritin with iron(III) bound to the ferroxidase site

Entity

Entity ID	Chain ID	Description	Type	Chain length	Formula weight	Number of molecules	DB Name (Accession)	Biological source	Descriptive keywords
1	A, B, C, D, E...	Ferritin, middle subunit	polymer	176	20623.2	24	UniProt (P07798) Pfam (PF00210) In PDB	Rana catesbeiana (bullfrogs)	Ferritin M, Ferritin H', Ferritin X
2	B, N, C, O, D...	FE (III) ION	non-polymer		55.8	50	Chemie (FE)
3		water	water		18.0	1545	Chemie (HOH)

Contents of the asymmetric unit

Polymers	Number of chains	24
	Total formula weight	494956.4
Non-Polymers*	Number of molecules	50
	Total formula weight	2792.3
All*	Total formula weight	497748.6

*Water molecules are not included.