after groups of mice were subjected to 56 , 64 , 72 , and 80 wk of tobacco smoke ( ts ) exposure , serum antibody responses to both t-dependent and t-independent antigens , numbers of plaque-forming cells , spleen cell and lymph node pha responses , and systemic clearance of normal and opsonised antigen were investigated .
C0003340
t-independent antigens
C0003320
antigen