In this series, “The Miraculous Immune System,” we explore the true power of immunity and the organs that work tirelessly to protect the body.
Previously: The thymus may shrink after training T cells, but it continues to play critical roles—many of which we are only beginning to understand. 
The little-known thymus gland is one of the body’s most essential immunological organs, beginning to develop before birth and reaching its peak function between the ages of 7 and 25.
The thymus is like a military base that trains soldiers—T cells—to battle for the immune system against dangers such as COVID-19 and cancer….