Lymphocytes can only recognize and be activated by antigens that have been processed and presented to them by either a _________ or _________ cell; these are collectively known as antigen-presenting cells or APCs.

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The Answer of Lymphocytes can only recognize and be activated by antigens that have been processed and presented to them by either a _________ or _________ cell; these are collectively known as antigen-presenting cells or APCs.

Lymphocytes Can Only Recognize and Be Activated by Antigens That