NEET BIOLOGY

Detailed explanation-1: -Embryonic stem cells (ESCs) are found in the inner cell mass of the human blastocyst, an early stage of the developing embryo lasting from the 4th to 7th day after fertilization. In normal embryonic development, they disappear after the 7th day, and begin to form the three embryonic tissue layers.

Detailed explanation-2: -Embryonic stem cells are obtained from the inner cell mass of the blastocyst, a mainly hollow ball of cells that, in the human, forms three to five days after an egg cell is fertilized by a sperm.

Detailed explanation-3: -A mouse blastocyst aged 3.5 days. The process of cell maturation and specialization that would normally take place in the embryo stops. Instead, the cells multiply to make more undifferentiated cells that resemble the cells of the inner cell mass. These laboratory-grown cells are called embryonic stem (ES) cells.

Detailed explanation-4: -Embryonic stem cells are located in the inner cell mass of blastocyst (from 4th-7th day after fertilization). Later, the inner mass cells differentiate into ectoderm, endoderm and mesoderm.

Detailed explanation-5: -Embryonic stem cells (ESC) are derived from the inner cell mass (ICM) of the developing blastocyst stage embryos five to eight days after fertilization.