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Hans Spemann was an experimental embryologist best known for his transplantation studies and as the originator of the "organizer" concept. One of his…
PeopleSpemann, Hans, 1869-1941TransplantationBiographySand dollars are common marine invertebrates in the phylum Echinodermata and share the same class (Echinoidea) as sea urchins. They have served as…
Sand DollarsFertilizationInvertebrates