THREE GERM LAYER

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5. THE PRIMARY YOLK SAC FORMS FROM
PROLIFERATING HYPOBLAST CELLS AFTER
IMPLANTATION. THE INNER CELL MASS BECOMES
A BILAMINAR DISC AS IT DIVIDES INTO THE
HYPOBLAST AND EPIBLAST.HYPOBLAST FORMS
THE YOLK SAC AND THE EPIBLAST FORMS THE
AMNION.

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