Extracellular biology

Extracellular Fluid
Interstitial fluid

Extracellular Molecular Chaperones
Chaperones help proteins folder currently and ensure quality control.

Quality control of protein folding in extracellular space

http://www.nature.com/embor/journal/v6/n12/full/7400586.html

Receptors
The Extracellular Region of the Receptor for Advanced Glycation End Products Is Composed of Two Independent Structural Units†

http://pubs.acs.org/doi/abs/10.1021/bi7003735

decoying "AGEs" - sRAGE http://paleocron.blogspot.com/2009/12/rage-more-than-emotion.html

http://www.betterhumans.com/blogs/news/archive/2006/10/18/Decoying-AGEs.aspx

Stem Cell Niche
Researchers find a way to delay aging of stem cells

http://phys.org/news/2012-05-aging-stem-cells.html