As reported by numerous medical sources, Reema Sandhu, is an account manager, lives in Bracknell, Berkshire, with husband and young son. She was diagnosed with multiple sclerosis in November 2015 after burning her face on a lamp. Multiple sclerosis is the most common demyelinating disease in which the insulating covers of nerve cells in the brain and spinal cord are damaged. This damage disrupts the ability of parts of the nervous system to transmit signals. As per reports, she regained much of her brain function including her vision through stem cell therapy.
(a) Which part of Reema's body could these stem cells have been sourced from?
(b) Why would stem cell therapy have helped Reema?