XB-STAGE-28
Definition: Nieuwkoop and Faber stage 16; age 18 hr 15 min at 22-24 Celsius; corresponding to the following external morphological criteria: Mid neural fold stage. Anterior part of neural plate rectangular; darkly pigmented eye anlagen present; neural plate sharply constricted in the middle. Inner ridges on neural folds forming angle of about 90 degrees with neural plate in rhombencephalic region. Length: 1.5 - 1.6 mm.
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[2.8.5]
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