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Immunology › View

Superantigens:

A. are harmless

B. bind to MHC class I outside the peptide binding groove

C. activate CD8+ T cells

D. bind to MHC class II outside the peptide binding groove

E. are processed

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Circulatory System › View

What is the purpose of blood circulatory system in vertebrates?

A. digest nutrients

B. transmit sensations

C. transport essential substances and waste products

D. produce carbohydrates

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