NYU LANGONE HEALTH / NYU GROSSMAN SCHOOL OF MEDICINE IMAGE: HAIR-COLORING STEM CELLS (AT LEFT, IN PINK) NEED TO BE IN THE HAIR GERM COMPARTMENT IN ORDER TO BE ACTIVATED (AT RIGHT) TO DEVELOP INTO PIGMENT. CREDIT: COURTESY OF SPRINGER-NATURE PUBLISHING OR THE JOURNAL NATURE Certain stem cells have a unique ability to move between...