PDCD1 and metabolic dysfunction-associated steatotic liver disease: Within the peripheral CD56dim NK cell population from NAFLD patients, the Siglec7−CD57+ and Siglec7+CD57+ subsets expressed much lower levels of NKp30 and NKp46 and higher levels of PD-1 and ILT2 compared with the Siglec7+CD57− and Siglec7−CD57− subsets (Figures 4C,D).