MACS (Magnetic-activated cell sorting) is a simple cell-sorting method that uses a magnetic field to isolate the desired cell. One of the most notable pros of MACS is that it significantly reduces the amount of time required to complete the cell-sorting process. For example, it is about 4 to 6 times faster than FACS, another widely-used cell-sorting method. Using MACS, researchers can run a higher quantity of samples in a shorter period of time. Another pro of MACS is that it reduces the total quantity of cells that need to be sorted.