The whole blastocyst retained three-dimensional structure, trophoblast did not flatten but retained a polarized removal and invasion like in vivo .

• 在人纤维蛋白凝胶上培养的囊胚可以保持囊胚的立体结构,并有滋养层细胞极性的迁移和部分细胞的植入,使其更接近于体内囊胚的着床行为。