Table 2.
The junction region of matrilins contains potential proteolytic cleavage sites.
| Matrilin | Species | Amino Acid Sequence | Number (a.a.) |
| MATN1 | Human | EEDP | 4 |
| Mouse | EEDP | 4 | |
| Chicken | EEDP | 4 | |
| MATN2 | Human | KLKKGICEALEDSDGRQDSPAGELPKTVQQPT ESEPVTINIQDLLSCSNFAVQHRYLFEEDNLL RSTQKLSHSTKPSGSPLEE | 83 |
| Mouse | KLKEGICEALEDSGGRQDSAAWDLPQQAHQP TEPEPVTIKIKDLLSCSNFAVQHRFLFEEDN LSRSTQKLFHSTKSSGNPLEE | 83 | |
| Chicken | ELKVQICEALRNSAHQQHLSSGRLHRTNPQPSGPESTTVEITDVLACPSLAIQHKYLFEDSQSHSTRTTAKT | 72 | |
| MATN3 | Human | ATEEARRLVSTEDA | 14 |
| Mouse | DIEEARSLISIEDA | 14 | |
| Chicken | RATTSSLVTDEEA | 13 | |
| MATN4 | Human | PEEGISAGTELRSP | 14 |
| Mouse | PEEGIGAGTELRSP | 14 | |
| Chicken | PEEGRGETEIRSP | 13 |
A pair of glutamic residues as the putative matrix cleavage site is underlined and is present in all the members of matrilin family across species with the only exception of chicken MATN2. a.a.: amino acid.