Fig. 3
From: Deer antler renewal gives insights into mammalian epimorphic regeneration
Schematics of stump wound healing process of second phalangeal element (P2; A-C) and fracture repair of P2 (D-F). A Freshly-amputated stump of a P2; note that the bone marrow cavity opens to the cut surface. B Prominent CCC (arrows) formed from the distal periosteal cells. C The CCC was remodeled to bone tissue; note that the bony callus gradually disappeared and eventually reverted to its original form. D Early stage of P2 fracture healing; note that CCCs (arrows) at both sides of the fracture line were formed. E Bridging callus (arrowheads) between the two CCCs started to form. F Late fracture healing stage; note that the bridging callus (arrowheads) had fully formed