| http://www.w3.org/ns/prov#value | - As a result thereof, it is now possible to provide a novel and useful therapeutic agent for cancer having an activating ability for NKT cells. [0011] Thus, an embodiment of the present invention is a composition mainly comprising a saccharide having an ??1???3 steric structure where an action of human NKT cells on NKR-P1 which is a natural killer (NK) cell antigen receptor of human NKT cells in an
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