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Introduction

Stage 7 embryos are in the presomite period with a well-defined embryonic disc. They have an estimated postfertilization age of approximately 18 to 21 days and a greatest length of 0.6 mm. The embryonic disc is symmetrical and slightly convex in the plane of its longitudinal axis. The gastrulation (primitive) node and notochordal process can be identified.

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Section 36

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Also on EHD: Upper and Lower Limbs

Embryo

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Section 44-2-2

Section 44-2-2

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