LIFE SCIENCE

Detailed explanation-1: -Researchers have discovered stem cells in amniotic fluid as well as umbilical cord blood. These stem cells have the ability to change into specialized cells. Amniotic fluid fills the sac that surrounds and protects a developing fetus in the uterus.

Detailed explanation-2: -Stem cells are pretty ubiquitous in the body, appearing in many different organs and tissues including the brain, blood, bone marrow, muscle, skin, heart, and liver tissues. In these areas, they lie dormant until needed to regenerate lost or damaged tissue.

Detailed explanation-3: -Stem cells are special cells produced by bone marrow (a spongy tissue found in the centre of some bones) that can turn into different types of blood cells.

Detailed explanation-4: -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.

Detailed explanation-5: -Cell lines that already exist. Spare embryos left over from fertility treatment. Custom-made embryos created by somatic cell nuclear transfer (SCNT), the technique used to create the sheep Dolly.