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Значения термина layer blastula на английском

Значения для термина "layer blastula" отсутствуют.
Использование термина layer blastula на английском
1
The germinal layers form from the first closed tubes, the one- layered blastula being converted into the two-layered gastrula by invagination.
The Evolution of Man — Volume 1
2
This is made up of several strata of cells, but it spreads over the yelk-ball, and thus becomes a one- layered blastula.
The Evolution of Man — Volume 1