Mouse heart transplantation is frequently used to investigate mechanisms of
rejection and immune response. A fully vascularized technique is presented
in which the graft ascending aorta is anastomosed end-to-side to the recip
ient's aorta and the pulmonary aorta is anastomosed end-to-side to the infe
rior vena cava using 11-0 Ethilon suture, We suggest that this double anast
omosis technique is a valuable tool to investigate immune mechanisms in mic
e.