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. 2014 Apr 9;2014:579279. doi: 10.1155/2014/579279

Table 2.

Leukocytes that have been found in the placenta during physiological pregnancy in humans, cows, and horses [29–33].

  Humans Cows Horses
Leukocytes in placenta Three major populations:
(i) Uterine Natural Killer (uNK) cells  
(ii) Macrophages 
(iii) T lymphocytes 
Other less abundant leukocyte populations:
(i) Dendritic cells
(ii) Natural Killer T (NKT)
(iii) Regulatory T cells		 Endometrial macrophages (as much as half of all immune cells)
Other less abundant
leukocyte populations:
(i) Dendritic cells
(ii) T lymphocytes		 Mostly T lymphocytes  
Other less abundant
leukocyte populations:
(i) B lymphocytes
(ii) NK cells
(iii) Eosinophils