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First exams 2025

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Making Monoclonal Antibodies (CIE A Level Biology)

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Naomi H

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Naomi H

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The Hybridoma Method

  • Monoclonal antibodies (mAbs) are artificially produced antibodies produced from a single B cell clone
    • Monoclonal antibodies bind to antigens in the same way as naturally produced antibodies
  • The hybridoma method is used to make monoclonal antibodies
    • The method enables large quantities of identical antibodies to be produced
    • The hybridoma method fuses plasma cells with tumour cells, combining their useful properties
      • Plasma cells can produce antibodies
      • Tumour cells can divide indefinitely by mitosis and produce more identical cells
  • The hybridoma method involves the following stages
    • Mice are injected with an antigen that stimulates the production of antibody-producing plasma cells
    • Isolated plasma cells from the mice are fused with immortal tumour cells, producing hybridoma cells
      • The fusion of plasma and tumour cells can be assisted with the use of fusogens such as polyethylene glycol or an electric current
    • These hybrid cells are grown in a selective growth medium and screened for the production of the desired antibody
    • They are then cultured to produce large numbers of monoclonal antibodies
  • Monoclonal antibodies have multiple applications, including diagnostics, treating disease, food safety testing and pregnancy testing

The Hybridoma Method (1) The Hybridoma Method (2)

The hybridoma method is used to produce monoclonal antibodies

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Naomi H

Author: Naomi H

Expertise: Biology

Naomi graduated from the University of Oxford with a degree in Biological Sciences. She has 8 years of classroom experience teaching Key Stage 3 up to A-Level biology, and is currently a tutor and A-Level examiner. Naomi especially enjoys creating resources that enable students to build a solid understanding of subject content, while also connecting their knowledge with biology’s exciting, real-world applications.