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I can't quite make out this teratoma:

           enter image description here
                         [Source: FIG 3B]

I can kind of guess at ectoderm, mesoderm and endoderm structures based on generalized textbook developmental biology references but it looks like the stain was messed up. Shouldn't a hematoxylin-eosin stain be blue and red? Is this a legitimate confirmation of germ cell development from human pluripotent stem cells?

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