Engraftment of bone lining cells after transplantation with TBM from 3.6-green donor mice. (A-B) Engraftment of 3.6-green donor-derived TBM cells. The recipient was a 3.6-blue mouse. (A) Injected tibia. (B) Ipsilateral femur. Now 3.6-green cells (arrows) line the bone but do not extend into the bone matrix. (C-D) Frozen nondecalcified section of bone from a nontransgenic recipient rescued by an intramedullary injection of TBM from a 3.6-green mouse. The recipient mouse was injected with XO 2 days prior to being killed. The injected femur (C) and the contralateral tibia (D) show bone surface 3.6-green cells but no associated XO labeling. (A-D) Original magnification, × 200.