The picture illustrates the Breast Cancer Prognostic Tissue Microarray. The excel file shows the general area on a Prognostic TMA slide where breast tumor tissue cores, normal breast tissue cores, and control cores will appear. There are nine sections of multiple breast tumor cores separated by control cores. These are .6 mm cores. There is a section of multiple normal breast tissue cores grouped below the breast tumor cores. These are 1.0 mm cores.