Bile samples collected from control dogs underwent cytological examination by an American College of Veterinary Pathology certified study investigator (D.S.). Each cytological specimen was prepared at the time of bile collection by smearing a drop of bile onto each of 2 individual glass microscope slides. Slides were air-dried, fixed, and stained with hematoxylin and eosin. Samples of gallbladder mucus from dogs with mucocele formation were not examined cytologically.
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