Two base P nucleotides at both ends of N2 and N1 Segment.

Number of two base P nucleotides at the both of the N2 segment is calculated in each donor and then normalized by its total number of unique sequences. The entries represent the mean and standard deviation of number of donors in each T cell type. Similarly, it was done for the N1 segment.

针对每个供体（donor），计算其N2区段（N2 segment）两端的双碱基P核苷酸（two base P nucleotides）的总数量，随后以该供体的独特序列（unique sequences）总数进行归一化。各条目表征每种T细胞类型（T cell type）对应的供体数量的平均值与标准差。同理，针对N1区段（N1 segment）也开展了相同的分析流程。