The probe that is used to count is called the counting frame. The counting frame is the most widely used probe in stereology. The counting frame is typically shown as a red and green probe, but it can also be shown in a black with part of the counting frame dashed. A number of rules for counting that accompany the counting frame have been developed to provide a method to rigorously count objects. The simplicity of the method is ingenious, yet the simplicity makes it possible to overlook some of the questions that turn up when counting.
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