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SEM images of the cell morphology and extracellular matrix secretion of MC3T3-E1 cultured on different samples for 1, 3 and 7 days: PEEK (a-1, a-2 and a-3), SPEEK-5 (b-1, b-2 and b-3), SPEEK-15 (c-1, c-2 and c-3), SPEEK-30 (d-1, d-2 and d-3), SPEEK-60 (e−1, e−2 and e−3) and SPEEK-90 (f-1, f-2 and f-3). All scale bar lengths are 20 μm.
