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"Frontiers in Bioscience"

PLATE NUMBER

STAGE

TIME

ORIENTATION

IMAGE

22

Mid-neural fold stage

Embryo early stage 15

17 h p.f.

Dorsal

Posterior Anterior

Ventral

Parasagittal section

Mid-neural fold stage (embryo early stage 15)

A view similar to that observed in plate 21 and at the same stage is seen more laterally.