Reproduced below is the text from Pieter A. De Vries and John B. De C. M. Saunders (1962) DEVELOPMENT OF THE VENTRICLES AND SPIRAL OUTFLOW TRACT IN THE HUMAN HEART - A Contribution to the Development of the Human Heart from Age Group IX to Age Group XV. Contributions to Embryology, No. 256. Carnegie Instn. Wash. Publ. 621, Contrib. Embryol. 37, 87-114.
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