STING1 and cancer: To elucidate the role of STING activation in MSCs conferring increased NK resistance to cancer cells, we knocked out STING in hESCs using CRISPR‐Cas9 (Figure S5A,B, Supporting Information) and then differentiated the STING−/− hESCs into E‐MSCs using a standard protocol[64] (Figure S5C, Supporting Information).