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https://theworld.org/public://story/images/lymphatic-system-discovery v2.jpg

lymphatic-system-discovery v2.jpg

lymphatic-system-discovery v2.jpg

New lymphatic vessels
The newly-discovered lymphatic vessels, shown in red, were almost invisible behind the larger blood vessels, shown in green.  “If you don’t know what you’re after, you just miss it," the lead researcher said.
Credit: University of Virginia