PG content of SRC tissue was compared with PG of murine B16F0 melanoma tumour as negative control: As shown in Figure 5, a high PG content was observed in SRC tissue (7.46 ± 2.41 μg of PG/mg of tissue), respectively, to melanoma (0.45 ± 0.16 μg of PG/mg of tissue). Here, SRC is linked to melanoma.