Relative mRNA expression levels of INFG were higher in sarcoidosis patients than in control subjects when the normalisation was done with gene PSMB2 (fold change ± SD: 2.56 ± 1.62; p = 0.004), with gene RPL32 (2.58 ± 1.46; p = 0.004), and with gene pair PSMB2-RPL32 (2.44 ± 1.20; p = 0.02) (Fig. 5). Here, PSMB2 is linked to sarcoidosis.