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"Human Biology fig. 1.12 - Bone matrix - English labels" by U.S. National Cancer Institute’s Surveillance, Epidemiology and End Results (SEER) Program is in the Public Domain.. modified by Marianna Ruiz Villarreal (User:LadyofHats/Wikimedia Commons) for CK-12 Foundation. Source: book ‘Human Biology’, https://textbookequity.org/Textbooks/HumanBiologyCK12.pdf.
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