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One inset shows the structure of a lymph node and the lymph vessels, with arrows showing how lymph and immune cells called lymphocytes move into and out of the lymph node. Another inset shows a close-up of bone marrow. This fluid contains many substances, including blood plasma , proteins , glucose , and oxygen. Interstitial fluid eventually collects in lymph vessels, where it becomes known as lymph. They contain B lymphocytes , T lymphocytes , and other types of immune system cells.

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