At what stage is the embryo implanted in the uterus of the mother in the case of test tube baby?

Explanation

To answer the question about the stage at which the embryo is implanted in the uterus of the mother in the case of a test tube baby, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding In Vitro Fertilization (IVF)**:
- In vitro fertilization is a process where fertilization occurs outside the female body. This is typically done in a laboratory setting.

2. **Fertilization and Early Development**:
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