Sex-mismatched cardiac transplantations, homing of recipient’s progenitor cells in the myocardium was demonstrated. In the procedure Y chromosome in situ hybridization was used to track the male cells in the female allografts coupled with immunostaining to define the identity that these cells had acquired.
Jackson et al. 2001  and Bittira et al. 2003 
Marrow-derived progenitor cells circulate and home to injured tissues similarly to leukocytes, where they contribute to the formation of new tissues.