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EMBO J. 1984 Jan;3(1):153-7.

Internal homologies of the Ba fragment from human complement component Factor B, a class III MHC antigen.


The amino acid sequence of Ba, a fragment of the complement protein Factor B, has been determined from the sequence of its corresponding cDNA. Ba is composed of 234 amino acids and from the sequence two striking regions of internal homology are apparent which are related to a third less homologous region. Analysis of cloned genomic DNA using an 81-bp cDNA probe containing coding information for part of a leader peptide and nine amino acids at the N terminus of Ba has established the extent of the 5' end of the Factor B gene and shown that the region of the gene encoding Ba is approximately 1.6 kb in length.

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