Word: mesoderm
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...Physique (Harper; $4.50), a summary of his work which he published last week, Dr. Sheldon describes and defines his three components. They are called endomorphic, mesomorphic and ectomorphic because the prominent features of each are derived, respectively, from the embryo's endoderm or inner layer (abdominal organs), the mesoderm or middle layer (bones, muscles, connective tissue, heart, blood vessels), and the ectoderm or outer layer (skin, hair, nails, sense organs, nervous system, brain...
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