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Figure 4: Differential interference contrast images of reserve zone-epiphysis/subchondral bone (RZ-EP/SB) interface by differential interference contrast (DIC) optical microscopy, from the femoral head of (a) 20-, (b) 35-, and (c) 480-day-old pig. Yellow arrowheads point to tidemarks. EP = epiphyseal bone, RZ = reserve zone, SB = subchondral bone, BM = bone marrow.