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Radula
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==In chitons== Each row of the [[polyplacophora]]n radula has two mineralized teeth used to abrade the substrate, and two longer teeth that sweep up any debris. The other 13 teeth on each row do not appear to be involved in feeding.<ref name="Steneck1982"/> The teeth of ''[[Chaetopleura apiculata]]'' comprise fibres surrounded by [[magnetite]], [[sodium]] and [[magnesium]].<ref name="Gordon2011">{{Cite journal | last1 = Gordon | first1 = L. M. | last2 = Joester | first2 = D. | doi = 10.1038/nature09686 | title = Nanoscale chemical tomography of buried organic–inorganic interfaces in the chiton tooth | journal = Nature | volume = 469 | issue = 7329 | pages = 194–197 | year = 2011 | pmid = 21228873| bibcode = 2011Natur.469..194G | s2cid = 4430261 }}</ref>
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