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Different stages of T-cell development and their corresponding immunophenotypes: Pro-T, pre-T, immature CD4 single positive (CD4ISP), pre-T-cell receptor (pre-TCR), CD4 and CD8 double positive (DP), and single positive (SP). sCD3: surface CD3; pTα+/TCRβ+: Pre-T-cell receptor alpha and TCR beta chain.
