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The structure of PD-L1 protein molecule. The numbers represent the amino acid. Sig P, signal peptide; it directs PD-L1 toward cell membrane; TM, transmembrane domain; Cytoplasmic: the cytoplasmic or intracellular domain of PD-L1. The intracellular domain contains several conserved motifs: RMLDVEKC, DTSSK and QFEET.
