PRF1 and sarcopenia: In contrast, Th1&Th2 cells, resident memory T cells, NK activating receptor, NK antimicrobial protein granulysin, granulocytes, exhausted T cells, effector memory T cells, cytolytic protein perforin, cytolytic activity, CD4+ T cells, B cells, and anti-inflammatory cytokines were less enriched in sarcopenia patients than in healthy controls.