The 56K autoantigen is identical to human annexin XI.

@article{Misaki1994The5A,
  title={The 56K autoantigen is identical to human annexin XI.},
  author={Yoshikata Misaki and G J Pruijn and Annemiete W C M van der Kemp and Walther J. van Venrooij},
  journal={The Journal of biological chemistry},
  year={1994},
  volume={269 6},
  pages={4240-6}
}
Anti-56K autoantibodies are present in sera from patients with various autoimmune diseases, predominantly in sera from patients with rheumatoid arthritis, systemic lupus erythematosus, or Sjögren's syndrome. To clarify the molecular structure of this autoantigen, we isolated a 2.0-kilobase pair cDNA clone considered to encode the full-length 56K autoantigen. The longest open reading frame encodes a 505-amino acid polypeptide, with a predicted molecular mass of 54.4 kDa. The in vitro translated… CONTINUE READING