関連ワード:  cd45ra and ccr7    cd45ra ccr7 gating    cd45ra ccr7 memory t cells    cd45ra ccr7 t cells    cd45ra ccr7 naive    cd45ra ccr7 cd62l    cd45ra ccr7 memory    cd45ra ccr7 cd27    cd45ra ccr7 temra    cd45ra ccr7 cd8