Monoclonal Antibodies · Pharmacology

What does the 'xi' in the name of the monoclonal antibody Rituximab indicate about its structure?

  1. It is a fully human antibody with no murine sequence
  2. It is a chimeric antibody with human and mouse regions
  3. It is a humanized antibody retaining only murine CDR regions
  4. It is an entirely murine (mouse-derived) antibody
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Correct answer: It is a chimeric antibody with human and mouse regions

The infix '-xi-' denotes a chimeric antibody, typically consisting of approximately 65% human and 35% mouse protein. This design helps reduce the immunogenicity compared to pure murine antibodies while maintaining high binding affinity.

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