Fig. 1
![Fig. 1](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs12917-017-1245-7/MediaObjects/12917_2017_1245_Fig1_HTML.gif)
Levels of ECs measured in SFs from contralateral (white histograms) and OA (black histograms) joints. Data are expressed as pmol/mg of lipid extract (a) or pmol/ml of SF (b) and are reported as arithmetic mean ± SEM. Differences were compared by the Student’s t test and asterisks indicate significant differences (OA vs healthy joints; p < 0.05)