In this particular population (population 1), the mastitis sample contained a significantly higher number of CD45 positive cells (78.2%) and higher amount of granzyme B positive cells (37.7%) in comparison with the sample from the adjacent breast (64.8% CD45+, 17.4% granzyme B+) or healthy population (51.5% CD45+, 11.9% granzyme B+) (Table 2). This evidence concerns the gene PTPRC and mastitis.