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Crystal structure of the Fab domain of omalizumab at 2.41A External Resource: Annotation Chains Family Name Domain Identifier Architecture Possible Homology Homology Topology Family Provenance Source (Version) B [auth L] 4HBT_3 e2xa8L1 A: alpha arrays X: Alpha-beta plaits H: Phage tail protein-like T: Transmembrane protein 14A F: 4HBT_3 ECOD (v295.2) A [auth H] Proteasome e2xa8H1 A: alpha arrays X: EF-hand H: Insect pheromone/odorant-binding proteins T: Insect pheromone/odorant-binding proteins F: Proteasome ECOD (v295.2) A [auth H] Ig_2 e2xa8H3 A: alpha arrays X: Subtilisin-like H: Subtilisin-like T: Subtilisin-like F: Ig_2 ECOD (v295.2)
Chain Protein Name Description Organism Name Gene Allele Name(s) Domain Name(s) Receptor Type Receptor Description Provenance Source B [auth L] IGE25, rhuMab-E25 L-KAPPA Homo sapiens (human) IGKV1-39*01, IGKV1D-39*01, IGKJ2*01, IGKC*01 V-DOMAIN V-KAPPA, C-DOMAIN C-KAPPA IG FAB-GAMMA-1_KAPPA IMGT (202639-0) A [auth H] IGE25, rhuMab-E25 VH-CH1 Homo sapiens (human) IGHV3-66*01, IGHV3-66*02, IGHV3-66*04, IGHJ2*01, IGHG1*01, IGHG1*02, IGHG1*03 V-DOMAIN VH, C-DOMAIN CH1 IG FAB-GAMMA-1_KAPPA IMGT (202639-0)
Chain Chain Class Chain Subclass Chain Type Antigen Name(s) Provenance Source B [auth L] Light Chain IGKV1 Kappa - SAbDab (2026-10-09) A [auth H] Heavy Chain IGHV3 - - SAbDab (2026-10-09)