英文釋義
an early metazoan embryo in which the ectoderm, mesoderm, and endoderm are established either by invagination of the blastula (as in fish and amphibians) to form a multilayered cellular cup with a blastopore opening into the archenteron or by differentiation of the blastodisc (as in reptiles, birds, and mammals) and inward cellular migration
例句 Example
However , content of the dissolvable protein and amino acid during gastrula stage during blastula stage.
總氨基酸含量在胚胎發育早期下降較快, 胚胎發育至後無節幼體期氨基酸含量下降幅度變緩.