A. Human error
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Infertility and In Vitro Fertilization. ... Unlike the simpler process of artificial insemination -- in which sperm is placed in the uterus and conception happens otherwise normally -- IVF involves combining eggs and sperm outside the body in a laboratory. Once an embryo or embryos form, they are then placed in the uterus.
Understanding the evolution of HIV in an individual will help scientist understand how the virus responds to different drug regimes and will lead to better treatments
