Lineage for Family a.102.4.4: Complement components
- Root: SCOP 1.71
Class a: All alpha proteins [46456] (226 folds) 
Fold a.102: alpha/alpha toroid [48207] (5 superfamilies)
multihelical; up to seven alpha-hairpins are arranged in closed circular array; there may be sequence similarities between different superfamilies
Superfamily a.102.4: Terpenoid cyclases/Protein prenyltransferases [48239] (4 families) 
Family a.102.4.4: Complement components [48251] (2 proteins)
probably related to other families, but has no known enzymatic activity
Proteins:
C3D, a C3 fragment and ligand for complement receptor 2 [48252] (2 species) Species Human (Homo sapiens) [TaxId:9606] [48253] (2 PDB entries) 
Species Rat (Rattus norvegicus) [TaxId:10116] [48254] (2 PDB entries)
C4adg fragment of complement factor C4a [81859] (1 species) Species Human (Homo sapiens) [TaxId:9606] [81860] (1 PDB entry)
More info for Family a.102.4.4: Complement components
Timeline for Family a.102.4.4: Complement components:
- Family a.102.4.4: Complement components first appeared (with stable ids) in SCOP 1.55, called Family a.102.4.4: C3D, a C3 fragment and ligand for complement receptor 2
- Family a.102.4.4: Complement components appears in SCOP 1.69
- Family a.102.4.4: Complement components appears in SCOP 1.73
- Family a.102.4.4: Complement components appears in the current release, SCOPe 2.08