the distribution of background ig-secreting cells , measured as cells containing cytoplasmic immunoglobulin ( c-ig cells ) , over spleen , bone marrow , lymph nodes and peyer 's patches was studied in congenitally athymic ( nude ) mice and heterozygous euthymic mice as a function of age and immune status ( germ-free ( gf ) vs specific pathogen-free ( spf ] .
C1327616
secreting
C0007634
cells