Cells can commit “suicide” to prevent the spread of a disease, change their code to stop themselves from dividing to create more diseased cells, change their code to preclude further modification, reproduce in response to stress, or potentially something outside of our present biological knowledge. Cells respond differently to different types of diseases — the immune system, typically, protects cells from viruses, and cells have outer walls to keep such malignant forces from gaining access.
Cells also possess a membrane that prevents and allows certaint molecules from entering or leaving the cell. Cells can also produce interferon, proteins made by host cells to fight off pathogens, an infectious agent.
Stem cells in bone marrow tissue can turn into white blood cells, red blood cells, and platelets in order to protect against disease.
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