A biological miracle is happening in anti aging where the body takes out the trash. The peptide reduced frailty markers by 50% in aged mice, inducing apoptosis (death) only in damaged cells. It FOXO4 DRI and FOXO4: Understanding the Differences, Mokiner Most people learn about senescent cells from a podcast. I learned about them the hard way after pushing my body through the Grand Goals campaign and realizing that physical achievement doesn't mean The FOXO4 peptide in a DRI conformation (D amino acids in a retro reversed sequence), henceforth named FOXO4 DRI, competes with FOXO4 for p53 binding in a dose dependent manner and doing so with higher affinity.