Uploaded October 2019 | Updated September 2026, 2 weeks ago
Learn what antibodies are, how they help protect our bodies from intruders like viruses and bacteria, and how autoimmune diseases can arise when antibodies get confused.
This video is part of the Bio-Dictionary for "The Explorer's Guide to Biology" (XBio for short), which is a bold re-imagining of the biology textbook for the 21st century. Visit explorebiology.org for free content that focuses on stories of scientific discovery.
Learn what antibodies are, how they help protect our bodies from intruders like viruses and bacteria, and how autoimmune diseases can arise when antibodies get confused.
This video is part of the Bio-Dictionary for "The Explorer's Guide to Biology" (XBio for short), which is a bold re-imagining of the biology textbook for the 21st century. Visit explorebiology.org for free content that focuses on stories of scientific discovery.








![Fluorescence: a tool to study molecular dynamics in biology
Fluorescence is used in Biology as a tool to study the internal of cells. In this video, Rémi Berthoz explains the basics of interactions between light and matter to schematically describe how fluorescent molecules can be used to monitor the flow of calcium ions in living cells. Watch Rémis video to learn more.
Rémi Berthoz is a student in the Cell Physics Master at the University of Strasbourg, France.
https://www.cellphysics-master.com
Related Resources :
Roger Y. Tsien et al. Nature Chemical Biology [Nat Chem Biol. 2007 Jul; 3(7): 423–431.].
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2909385/ Fluorescence: a tool to study molecular dynamics in biology](https://i.ytimg.com/vi/KQhAS7OYu94/mqdefault.jpg)

