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I'm renaming the categories to reflect the stem cell lineage, not the system. This is because it's misleading and confusing to say that eg. the digestive system develops from mesoderm as is implied when digestive system is a heading. I understand that this has been done to increase readability, but I don't think that lay users will be perusing a navbox titled "Cells derived primarily from mesoderm" without some familiarity with the subject matter. --Tom (LT) (talk) 10:29, 18 August 2015 (UTC)