Blastomeres of the morula (solid mass of cells) start to secrete fluid. This collect to form a central cavity called the blastocoele. With more fluid, the cavity progressively increases in size. Till now the cells were similar. Now the differentiation occurs with the formation of two different cell types the trophoblasts and embryoblasts. The trophoblasts …our website : www.surrogacycentreindia.com
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