White blood cells that ingest substances, including cells and viruses, that have been marked as foreign by the body defenses or are missing markers that identify them as belonging to the body

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The phagocytes are the white blood cells that ingest (engulf and digest) foreign substances including cells and viruses that are marked as foreign by the immune system or are without markers that identify them as belonging to the body. Antibodies, bacteria, lymphocytes, and antigens are not phagocytes.

White Blood Cells That Ingest Substances, Including Cells and Viruses