3.6.1.19 down dogs infected with Rangelia vitalii had a reduction in the hydrolysis of ATP and ADP in platelets at day 12 post infection due to a reduced expression of the enzyme 733801 3.6.1.19 up addition of extracellular ATP upregulates expression of ecto-nucleoside triphosphate diphosphohydrolase 2 and ecto-5'-nucleotidase 734511