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I discovered this recently when doing research on our current COVID crisis. It is another verification that the Urantia Book Revelation is true.

65:4.3 (735.2) Many features of human life afford abundant evidence that the phenomenon of mortal existence was intelligently planned, that organic evolution is not a mere cosmic accident. When a living cell is injured, it possesses the ability to elaborate certain chemical substances which are empowered so to stimulate and activate the neighboring normal cells that they immediately begin the secretion of certain substances which facilitate healing processes in the wound; and at the same time these normal and uninjured cells begin to proliferate—they actually start to work creating new cells to replace any fellow cells which may have been destroyed by the accident.
"65:4.4 (735.3) This chemical action and reaction concerned in wound healing and cell reproduction represents the choice of the Life Carriers of a formula embracing over one hundred thousand phases and features of possible chemical reactions and biologic repercussions. More than half a million specific experiments were made by the Life Carriers in their laboratories before they finally settled upon this formula for the Urantia life experiment.
65:4.5 (735.4) When Urantia scientists know more of these healing chemicals, they will become more efficient in the treatment of injuries, and indirectly they will know more about controlling certain serious diseases."
These "healing chemicals" were discovered in 1983. This is another verification of the truth of the Urantia Book:
"Exosomes were first discovered in the maturing mammalian reticulocyte (immature red blood cell) by Stahl and group in 1983 and Johnstone and group in 1983[further termed 'exosomes' by Johnstone and group in 1987. Exosomes were shown to participate in selective removal of many plasma membrane proteins as the reticulocyte becomes a mature red blood cell (erythrocyte). In the reticulocyte, as in most mammalian cells, portions of the plasma membrane are regularly internalized as endosomes, with 50 to 180% of the plasma membrane being recycled every hour.In turn, parts of the membranes of some endosomes are subsequently internalized as smaller vesicles. Such endosomes are called multivesicular bodies because of their appearance, with many small vesicles, (ILVs or "intralumenal endosomal vesicles"), inside the larger body. The ILVs become exosomes if the MVB merges with the cell membrane, releasing the internal vesicles into the extracellular space."
https://en.wikipedia.org/wiki/Exosome_(vesicle)