title: Bone marrow as a major lymphoid organ in Rana.
mesh_terms: D000818:Animals; D000917:Antibody Formation; D001001:Anura; D001853:Bone Marrow / Q000276:immunology*; D006168:Guinea Pigs; D006462:Hemolytic Plaque Technique; D007958:Leukocyte Count; D007962:Leukocytes / Q000276:immunology; D008214:Lymphocytes / Q000276:immunology; D008221:Lymphoid Tissue / Q000276:immunology*; D008938:Mitosis; D011892:Rana catesbeiana; D011894:Rana pipiens; D013154:Spleen / Q000276:immunology; D013997:Time Factors; D014981:Xenopus