A 1:02 minute YouTube video animation from Mr Riddz Science.

A 7:06 minute YouTube video from Armando Hasudungan. He can draw and explain immunology with speed and accuracy!

Learn the difference between innate and adaptive responses, and humoral and cell-mediated responses in this 8:06 minute video from Khan Academy.

Interleukin-6 at high levels has been linked to depression symptoms in mice. A 2013 article from ScienceDaily.com

Researchers at National Jewish Health have found that when lysophospatidic acid binds to killer T cells, it keeps the cells from recognizing and destroying cancer cells. An article from ScienceDaily.com, October 28, 2013.

Beneficial and bad microbes live inside and out of our bodies. A 2013 article from ScienceNews.org