Endochondral ossification in the electron microscopic image.
D000367:Age Factors; D000818:Animals; D001842:Bone and Bones / Q000648:ultrastructure*; D002356:Cartilage / Q000502:physiology / Q000648:ultrastructure*; D008684:Metatarsus / Q000648:ultrastructure; D051379:Mice; D010012:Osteogenesis