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A human monoclonal antibody (HuA) specific for blood group A
substance with two fucose groups was found to be immunochemically
almost identical with that of a previously characterized mouse
monoclonal anti-A, AC-1001. The V
The cloned HuA V
Volume 270,
Number 21,
Issue of May 26, pp. 12457-12465, 1995
©1995 by The American Society for Biochemistry and Molecular Biology, Inc.
and V
chain
cDNAs of HuA were sequenced and compared with those of AC-1001. The
human and mouse antibodies used V
and V
genes
that came from different families and shared minimal nucleotide and
amino acid sequence identity. Thus, two antibodies from two different
species can use evolutionarily unrelated sequences to bind the same
carbohydrate epitope.
and V
genes were then transfected into a mouse myeloma cell line and
re-expressed, together, and each separately with an irrelevant V
or V
. Only the original HuA V
and V
had anti-A activity, demonstrating that both the heavy and light
chains contributed to specificity.
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