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Figure 3. Surface appearance of the wear tracks in the SEM; (a) Si3N4-disc slid against Si3N4-ball in PBS, the arrow follows the wear track; (b) CoCr-disc slid against Si3N4-ball in PBS; (c) Si3N4-disc slid against Si3N4-ball in bovine serum, the arrow follows the wear track; (d) CoCr-disc slid against Si3N4-ball in bovine serum.
