Study shows how mast cells manage calcium levels to control the invulnerable reaction Kumar Jeetendra | July 23, 2020 Instead of protecting us, the immune system can sometimes go awry, as in the case of autoimmune disorders and allergies. An Ludwig-Maximilian-Universitaet (LMU) in Munich group has dissected how mast cells modulate their calcium levels to maintain the immune response under control. The immune system defends us against attack by germs and viruses and also …