Figure 3: Histology images of reserve zone-epiphysis/subchondral bone (RZ-EP/SB) interface, stained with H&E, for the femoral head of (a) 20-, (b) 35-, and (c) 480-days-old pig. (d), (e), and (f) are magnified images of black rectangular in (a), (b), and (c), respectively. (g), (h), and (i) indicate cell features in RZ-EP/SB interface for 20-, 35-, and 480-days old pig. Red asterisks denote hypertrophic cells and black arrowheads point to cells associated with neocartilage. EP = epiphyseal bone, RZ = reserve zone, SB = subchondral bone, BM = bone marrow.