title: Age-related variation in proportion of circulating T cells.
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D000375:Aging; D000818:Animals; D001800:Blood Specimen Collection; D004912:Erythrocytes / Q000276:immunology; D006801:Humans; D007104:Immune Adherence Reaction; D007223:Infant; D007231:Infant, Newborn; D007958:Leukocyte Count; D009000:Monocytes; D012737:Sex Factors; D012756:Sheep / Q000276:immunology; D013601:T-Lymphocytes / Q000166:cytology / Q000276:immunology*; D014470:Umbilical Cord; D014680:Veins