Fig. 1From: May critical molecular cross-talk between indoleamine 2,3-dioxygenase (IDO) and arginase during human aging be targets for immunosenescence control?A IDO activity (Kyn / Trp) (Y-Axis) is shown to be significantly elevated with age (X-Axis). B The sum of the essential amino acids (Y-Axis) shows an inverse correlation with IDO levels (X-Axis)Back to article page