The early stages of development of a fertilized egg. In somatic cell nuclear transfer, it refers to the early developmental stages of an enucleated egg after it has been fused with a somatic cell. An egg cell from which the nucleus has been removed. This is usually accomplished by penetrating the cell with a fine glass needle and withdrawing the nucleus while observing the process under a microscope. The period of time it takes an embryo to develop in the uterus from a fertilized egg to a newborn offspring.
Gestation begins with implantation of the embryo in the uterus and ends with birth.
The structure within a cell that contains the genetic material or genes. The nucleus is surrounded by a membrane that separates it from the remainder of the cell. An egg cell. A female reproductive cell. Any cell from the body of a mammal or human, other than the germ cells.