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This Concept Map, created with IHMC CmapTools, has information related to: Nuclear DNA and mtDNA, nucleated corneocytes exist because of an absent step, keratinocytes which make keratin, cornification which skips degradation of cell nucleus and DNA, cornification destroys cell nucleus, absent step during cornification, nucleated corneocytes which makes it possible to extract Nuclear DNA, Hair made from cells, cells called keratinocytes, cells have mitochondria, hair shaft may have nucleated corneocytes, mitochondria which have mtDNA, keratinocytes have a final stage called differentiation, Hair composed of hair shaft, nuclear DNA in nucleus however, DNA can be extracted from hair root, cornification destroys nuclear DNA in nucleus, abundant than nuclear DNA, hair root contains keratinocytes, mtDNA is much more abundant, keratin dies and gets converted to hair and this is called cornification