Figure 1.

Enzyme‐linked immunosorbent assay (ELISA) data of endogenous transforming growth factor (TGF)‐β1 generated in serum‐free culture medium under static or multiaxial loading conditions. (a–d) Total endogenous TGF‐β1 secreted into condition culture media from week 1 to week 4. (e–h) Activated TGF‐β1 as a percentage of total TGF‐β1 from week 1 to week 4. Statistical significance was defined as p ≤ 0.05 and determined using the Kruskal–Wallis and Dunn's multiple comparison tests. *represents P ≤ 0.05, **represents P ≤ 0.01, ***represents P ≤ 0.001 and ****represents P ≤ 0.0001 (n = 4 donors)