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Representative sections of gels before (A, B) and after 5 days (B-E) in vitro incubation showed OA was detected in gels in both low OA (A, C) and high OA (B, D) groups while no OA in gel only group (E) Before and after incubation, the amount of OA in the high OA group (B, D) appeared higher than that in the low OA group (A, C). The amount of OA in each low or high OA group after incubation appeared to be similar in the gels before incubation. Scale bar = 2 mm applies to all images.
