发现鸡胚在第8、10、12天胚龄时CAM EC都位于外胚层绒毛膜上皮之下，随胚龄增大，EC逐渐由中胚层移向外胚层。
We discovered that CAM ec on day 8, 10, and 12 after incubation localized beneath the chorionic ectoderm, but with the age growing, ec gradually migrated toward ectoderm from mesenchyme.
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