Final answer:
The correct option is C. The antigen-antibody interaction has applications in Western blot, Antibody-affinity chromatography, and Fluorescence-activated cell sorting (FACS), but not Fluorescence recovery after photobleaching (FRAP).
Step-by-step explanation:
The antigen-antibody interaction is utilized in all the options mentioned except for Fluorescence recovery after photobleaching (FRAP). Let's discuss the applications of antigen-antibody interaction in the other options:
- Western blot: In this technique, specific proteins are identified using antibodies after gel electrophoresis. It helps in detecting and analyzing proteins of interest.
- Antibody-affinity chromatography: This method uses antibodies coupled to a solid support to isolate and purify proteins based on their affinity for the antibody. It helps in separating and purifying specific proteins from a mixture.
- Fluorescence-activated cell sorting (FACS): FACS utilizes fluorescently labeled antibodies to sort and analyze cells based on their specific surface markers or antigens. It is commonly used in immunology and cell biology research.