Injecting the cells into a c57bl6 blastocyst

Question: Assume you have isolated C57BL6 trophoblast stem cells and have propagated them on MEFs with heparin. To test for the success of your culture protocol, you are injecting the cells into a C57BL6 blastocyst. Once the pups are born, you notice that your experiment failed. Why? What was the expected outcome of this injection?

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