1FSL

FERRIC SOYBEAN LEGHEMOGLOBIN COMPLEXED WITH NICOTINATE

Entity

Entity ID	Chain ID	Description	Type	Chain length	Formula weight	Number of molecules	DB Name (Accession)	Biological source	Descriptive keywords
1	A, B	LEGHEMOGLOBIN A	polymer	143	15260.3	2	UniProt (P02238) Pfam (PF00042) In PDB	Glycine max (soybean)
2	A, B	PROTOPORPHYRIN IX CONTAINING FE	non-polymer		616.5	2	Chemie (HEM)
3	A, B	NICOTINIC ACID	non-polymer		123.1	2	Chemie (NIO)
4		water	water		18.0	70	Chemie (HOH)

Contents of the asymmetric unit

Polymers	Number of chains	2
	Total formula weight	30520.7
Non-Polymers*	Number of molecules	4
	Total formula weight	1479.2
All*	Total formula weight	31999.9

*Water molecules are not included.