2C1O

ENAIIHis Fab fragment in the free form

Entity

Entity ID	Chain ID	Description	Type	Chain length	Formula weight	Number of molecules	DB Name (Accession)	Biological source	Descriptive keywords
1	A, D (A, L)	IGK-C PROTEIN	polymer	254	28091.4	2	Pfam (PF07686) Pfam (PF07654) UniProt (by SIFTS) (Q58EU8)	MUS MUSCULUS	ENA11HIS ANTIBODY
2	B, C (B, H)	IGH-4 PROTEIN	polymer	218	23495.2	2		MUS MUSCULUS	ENA11HIS ANTIBODY
3	E, F, G, H (A, B, H, L)	water	water		18.0	192	Chemie (HOH)

Contents of the asymmetric unit

Polymers	Number of chains	4
	Total formula weight	103173.3
All*	Total formula weight	103173.3

*Water molecules are not included.