21. The hybrid cells can be propagated

A. in tissue culture
B. as ascites in the peritoneal cavity of mice
C. both (a) and (b)
D. none of these


Correct Answer: C. both (a) and (b)

22. Tc cells are important in controlling

A. virus infections
B. allergy
C. autoimmunity
D. all of these


Correct Answer: D. all of these

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