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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“Protophloem.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/protophloem. Accessed 28 Feb. 2021.
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Time Traveler for protophloem
The first known use of protophloem was in 1884
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