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Cell adhesion on the various samples after incubation for 12 and 24 h: PEEK (a-1 and a-2), SPEEK-5 (b-1 and b-2), SPEEK-15 (c-1 and c-2), SPEEK-30 (d-1 and d-2), SPEEK-60 (e−1 and e−2) and SPEEK-90 (f-1 and f-2). All scale bar lengths are 100 μm. (g): Average cell number of MC3T3-E1 counted on three different samples for each group. p < 0.05, n = 5.
