heterocyst
noun
het·ero·cyst
ˈhe-tə-rō-ˌsist 
: a large transparent thick-walled cell that is found in the filaments of some cyanobacteria and is the site of nitrogen fixation
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“Heterocyst.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/heterocyst. Accessed 24 Apr. 2024.
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