A naive T cell is migrating from the blood into a lymph node and first rolls along high endothelial venules of the lymph node. Which of the following is expressed by the T cell to facilitate the rolling process?  A. C3a  B. CD4  C. ICAM-1  D. lgM  E. L-selectin

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A:

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A: We will answer the first question since the exact one was not specified. Please submit a new questio...