Question
In E.T. techniques, embryos are always transferred into the uterus.
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| S.No. | Type of Barrier | S.No. | Barrier |
| a. | Physical | i. | Skin, a |
| b. | Physiological | ii. | b, in the eye |
| c. | c | iii. | Interferon |
| d. | Cellular | iv. | WBC, d |
OR
List the four steps to isolate DNA from a bacterium.