Expression of proteins and mRNAs of Flt-1 were detected in COC, immature oocytes, embryos in 2-cell, 8-cell, blastocyst, and hatched blastocyst stage.

• 在牛卵丘-卵母细胞复合体、未成熟卵母细胞、2-细胞期胚胎、8-细胞期胚胎、桑椹胚及植入前囊胚中均能检测到Flt-1蛋白与mRNA。