Basophils, in general, contain
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Canine basophil
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dark purple granules in the cytoplasm. The canine and feline basophil is an exception.
The canine basophil has very faint lavender granules, but a long, thin
(ribbon-like) nucleus (see photo at right). Feline basophils have more
prominent round, lavender granules.
Basophils are produced in marrow. The number in blood is very
small in all species normally, but a few can usually be found in smears
from healthy horses and ruminants.
Increased numbers of basophils (basophilia) is a relatively rare finding,
which usually occurs in association with eosinophilia.
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