along with these subtle changes in the allo-receptor repertoire of t cells derived from bone marrow of aged mice grown in irradiated f1 hosts , there is a decrease ( compared with mice reconstituted with bone marrow from young donors ) in the apparent frequency of t cells recognizing antigen in association with the new mhc-restricting elements in these parent f1 chimaeras .
C0034790
receptor
C0039194
t