Humanised antibodies.

摘要

CDR grafted antibody is claimed having one chain derived from a first (acceptor) antibody and (pref. 2) CDR(s) derived from a second (donor) antibody. Residue(s) pref. residue 35 in the CDR grafted chain has been altered so it corresp. to the equiv. residue in the antibody. The CDR chains are pref. derived from a human lgG chain. The heavy chain may be derived from the human NEW M or EU or pref. KOL chain. The light chain is pref. derived from the human REl light chain. The CDR grafted antibody has an affinity for the CD4 antigen of 10power5 - 10power12 M-1 pref. 10power8. Affinity is similar to that of OKT4A. CDR(s) may be derived from a mammalian (murine) antibody. Prodn. of the antibody is claimed by recombinant DNA technology.