Describe the process used for harvesting embryonic stem cells

Altered Nuclear Transfer  New method

the embryos are grown into cell clusters.

the inner mass of the embryo  is rich in embryonic stem cells.

the inner mass is therefore harvested , and the embryo discarded.

      somatic Cell Nuclear Transfer (SCNT)-Old method.

somatic cells are  grown in the laboratory.

donor cells with the nucleus removed are provided.

the  somatic  cells nucleus  are removed, and planted into the donor cells.

the donor cells  undergo pseudo fertilization, and the embryo formed.

the inner mass cells is harvested  for the embryonic cells with the death of embryo,

a symbiotic relationship with the mitochondria

before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.