It's a built-in data. The name of the list represent 24 immune cells, the value of the list are 24 immune cells type-specific gene signatures from Bindea et al
Bindea G, Mlecnik B, Tosolini M, Kirilovsky A, Waldner M, Obenauf AC, et al. Spatiotemporal dynamics of intratumoral immune cells reveal the immune landscape in human cancer. Immunity. 2013;39:782–95.
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