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Table 2 Main characteristics of studied specimens defining each developmental stage

From: RNA-sequencing of the sturgeon Acipenser baeri provides insights into expression dynamics of morphogenic differentiation and developmental regulatory genes in early versus late developmental stages

Sample name Developmental stage Main morphological characteristics
T1 Big yolk plug The formation of large yolk plug:
About 32 h after fertilization, the embryo develops into yolk plug period: blastopore endodermal cells are still externally exposed at the vegetal pole, formation of a large yolk plug inserted in the germ ring, at this time the animal is very bright yellow and the plant polar pigmentation is very deep.
T2 Wide neural plate Obvious wide neural plate divided into both internal and external parts: about 45 h after fertilization, there is apparition of an obvious wide neural plate; around the neural plate in the head region, there is a clear shaped horseshoe formation; the neural plate grows longitudinally and is divided into inner and outer parts; in the center of the neural plate grows a longitudinal neural groove.
T22 64-day-old fish with electrical receptors ganglion Fully developed bone plate, 14–16 dorsal spines, 45–47 lateral bone plates, 7–9 abdominal bone plates. Presence of ampullary organs on the ventral face