Table 1 List of 26 distinct proteins uniquely identified in cartilage + synovium co-culture day 2 media

2-Iminobutanoate/2-iminopropanoate deaminase

LanC like 1

6-Phosphogluconolactonase

MAGE family member D2

Acetyl-CoA acetyltransferase 2

Oxidative stress responsive 1

Adducin 3

Papilin

Aminopeptidase

Peptidyl-prolyl cis-trans isomerase-like 1

Carbonic anhydrase 3

Poly(U)-binding-splicing factor PUF60

CCR4-NOT transcription complex subunit 3

Procollagen C-endopeptidase enhancer 2

General vesicular transport factor p115

Prostaglandin reductase 2

Heme-binding protein 2

SEC31 homolog A, COPII coat complex component

HSPC321 protein

Splicing factor 3A subunit 1

Interleukin enhancer binding factor 2

Spondin 2

Inverted formin, FH2 and WH2 domain containing

Thimet oligopeptidase

Isoamyl acetate-hydrolyzing esterase 1 homolog

Twisted gastrulation BMP signaling modulator 1