library_construction_protocol: Chromium Single Cell 3' Reagent Kits v3.1, Dual Index(10x Genomics, Inc).The 1-28 bp of sequence displays read1(10x Barcode, UMI). The 29-38 bp of sequence displays i7 Index(Sample Index). The 39-48 bp of sequence displays i5 Index(Sample Index).  The 49-138 bp of sequence displays read2(Insert).