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This "undifferentiation" is actually possible and it is known as induced pluripotent stem cell (iPSC). The first "undifferentiation" cells i.e. iPSCs were mouse fibroblasts created in 2006 by researchers in Shina Yamanaka's lab who got the Nobel prize in 2012 for this work. You can find further reading on this topic on the according Wikipedia-Page or more ...


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I would say that the left part of the picture depicts 2 stages of the development of cysticercoid, while the right part shows the consecutive stages in the development of cysticercus. These two parts represent different species of tapeworms in the same stage of their developments.



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