Upon entering your first white cell, the core of the algorithm starts. The second player now colours a white cell. Leukostasis is diagnosed when white cell plugs are seen in the microvasculature. The strength of this association increases inversely with the total white cell count. Very high white cell counts may also require cytoreduction with apheresis. Two conventional multipass cells are called the White cell and Herriott cell. As no areas are currently blue, any white cell is allowed. A few white cell spots are also present on the underside of the forewings. Other laboratory findings include normal peripheral white cell count, and occasional leucopenia with relative lymphocytosis. Blood analysis usually shows a normal white cell count, but marked leukocytosis is occasionally apparent.