Stem cells have the potential to develop into different types of cells in the body. These cells are undifferentiated, so they cannot do specific functions in the body. Instead, they have the potential to become specialized cells, such as muscle, blood, or brain cells. Human breast milk contains mammary stem cells – precursor cells from the mother that may help establish organs like the liver, kidneys, pancreas, and brain, a phenomenon known as microchimerism. In this clip, Dr. Rhonda Patrick describes the strange phenomenon and role of mammary stem cells in breast milk.