Template:Streeter-embryo to fetus

From Embryology
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Historic Embryology - In 1949 the embryologist George Streeter[1] used the replacement of cartilage within the humerus by bone marrow as an arbitrary definition of the embryo to fetus transition.
"If the onset can be recognized in a given specimen, that specimen is straightway classed as a fetus."
Embryology History George Streeter