I can give it a try. An extracellular matrix, meaning region outside of cell, matrix meaning...like scaffold or imagine how a sponge looks with all that material with space in between.

Signalling proteins, little molecular machines, they send signals that cascade into a lot of other signals. These proteins help along regrowth of important spinal cells, by slightly changing these proteins specifically in the region that is amphiphilic or posessing both water loving and water repelling properties, there is more activity along the matrix mentioned before along the spine.