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pro·to·phlo·em | \ ˌprō-tə-ˈflō-ˌem 
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\Definition of protophloem
: the first-formed phloem that develops from procambium, consists of narrow thin-walled cells, and is usually associated with a region of rapid growth
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Time Traveler for protophloem
The first known use of protophloem was in 1884
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