Page 370 - Veterinary Immunology, 10th Edition

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FIG. 13.6 The development of T and B lymphocytes. Both arise
from bone marrow precursors. B cells develop in the bursa, Peyer's
patches, or bone marrow. T cells develop in the thymus. Innate
lymphoid cells are a third population of lymphocytes that are distinct
from T and B cells.

TABLE 13.2

Major Peripheral Blood Lymphocyte Populations in Mammals
as Percentages of the Total Population

T Cells B Cells CD4 + CD8 + CD4/CD8
Horses 38-66 17-38 g 56 h 20-37 g 4.75 h
Bovine 45-53 a 16-21 a 8-31 10-30 1.53 a
Sheep 56-64 b 11-50 c 8-22 c 4-22 c 1.55 b
Pigs 45-57 d 13-38 e 23-43 17-39 1.4 f

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