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Sources:
https://www.ncbi.nlm.nih.gov/pubmed/17372553
http://www.sciencedirect.com/science/article/pii/S1286457906002280
http://scienceline.ucsb.edu/getkey.php?key=3273
http://www.livescience.com/26983-lymphatic-system.html
http://medcell.med.yale.edu/histology/immune_system_lab/palatine_tonsil.php
https://www.ncbi.nlm.nih.gov/pubmed/19716006
Image Sources:
https://commons.wikimedia.org/wiki/File:Tonsillolith_in_mouth.jpg
https://commons.wikimedia.org/wiki/File:Throat_with_Tonsils_0012J.jpeg