Many Paths to the Same Attractor State (image) Boston Children's Hospital Caption When exposed to a growth factor, a blood stem cell, represented by a blue marble, falls into a new "attractor state," depicted as a valley in a landscape, to become a red blood cell. Different influences, such as differentiation factors, can lead stem cells to the same attractor state, but each cell can take very different paths though the landscape to get there (just as a marble might take a different path each time it rolls down a hill). Credit Graham Paterson, Children's Hospital Boston Usage Restrictions None Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.