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"Frontiers in Bioscience"

DAY

STAGE ACTION

CARNEGIE STAGE

ORIENTATION

IMAGE

LENGHT (mm)

24

13-Somite.
Embryo is curved.
Rostral neuropore is closed, caudal neuropore is open.

11

Cranial

Caudal

Lateral view

2,5-4,5

Embryo; 13-somite stage (Cornegie stage 11), dorsal view, ~day24

The embryonic disc is now folded at both the caudal and cranial aspects. The rostral neuropore is no longer open but the caudal one is still open to the amniotic cavity.