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noun
tono·fil·a·ment
-ˈfil-ə-mənt 
: a slender cytoplasmic organelle found especially in some epithelial cells
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“Tonofilament.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/tonofilament. Accessed 26 Sep. 2022.
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