| Human and mouse | Reference |
| Antigen presenting cells: macrophages, monocytes, and DCs (CD8α +, CD8α −, and plasmacytoid DCs in mouse; interstitial and Langerhans DCs but not plasmacytoid DCs in humans) | [20] |
| Lymphocytes: B cells, CD4+, and CD8+ T cells, Treg cells, γ δ T cells, and NK cells | | Granulocytes: neutrophils, basophils | [21, 22] | Some epithelial cells | |
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| Species | Cells and tissues reported to express TLR2 | Methoda | Information on the level of expression | Reference |
| Bovine | Monocytes | RT-PCR/FC | Strong | [23, 28] | Monocyte derived-macrophages | RT-PCR/FC | Alveolar macrophages | RT-PCR/FC | Intermediate | Monocyte derived-DCs | RT-PCR/FC | Weak | CD172+ DCs | RT-PCR/FC | CD172− DCs | RT-PCR/FC | CD21+ B cells | RT-PCR | No signal | [28] |
| Ovine | CD14+ monocytes from PBMCs | FC | | [23] |
| Nilgai and Buffalo | PBMCs, monocytes, DCs, testes, skin | RT-PCR | Higher in Nilgai than Buffalo |
[29] | Buffalo | Kidney, endometrium, bone marrow, trachea | RT-PCR | Higher in endometrium and bone marrow |
| Swine | Mesenteric lymph nodes and Peyer's patches | RT-PCR, IHC, FC | Higher than in spleen by RT-PCR |
[30] | Heart, thymus, lung, kidney, skeletal muscle, small intestine | RT-PCR | Lower than in spleen | M cells | IHC, FC | | T and B cells | FC | Higher in T cells than in B cells | Monocytes, macrophage, and granulocytes, but not on peripheral blood lymphocytes | FC | |
[24] | Epithelial cells lining body entries (Lung, jejunum, kidney, liver) | IHC | | Alveolar Macrophages | WB | | [17] |
| Equine | PBMCs | RT-PCR | | [33] | Alveolar macrophages | RT-PCR | | [31] | Respiratory epithelial tissues | RT-PCR | | [32] |
| Chicken | Heart, liver, gizzard, muscle | RT-PCR, WB | Strong | [26] | Spleen, caecal tonsil, bursa, liver | RT-PCR | Strong | [34] | Heterophils, monocytes, macrophages, B and T cells | RT-PCR | | [34, 35] |
| Canine | Blood mononuclear cells, lymph node, lung, liver, spleen, bladder, pancreas, small intestine, large intestine, and skin | RT-PCR | | [18] | Blood neutrophils | RT-PCR | |
[27] | Blood neutrophils, monocytes | FC | Higher levels | Lymphocytes | FC | Lower levels |
| Feline | Spleen, thymus | RT-PCR | |
[36] | CD4+ T cells, CD8+ T cells, CD21+ B cells | RT-PCR | Higher in B cells than in T cells | BM-DCs | RT-PCR | | [37] | Palatoglossal mucosa | RT-PCR | | [38] |
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