详细链接：https://support.10xgenomics.com/docs/bamtofastq
bamtofastq是10X官方专门开发的针对cellranger, cellranger-atac, cellranger-arc, cellranger-dna, spaceranger or longranger等软件生成的Bam倒推出fastq文件的工具。BAMs produced for TCR or BCR data, by aligning to a V(D)J reference with cellranger vdj or cellranger multi, are not supported by bamtofastq. Special tags是必须的，不然会报“WARNING: no @RG (read group) headers found in BAM file.”错误。所以从SRA下载的BAM文件也需要注意是否去除Tag。
/home/chenhy/software/bamtofastq-1.3.2 --nthreads=8 shr_root_mut_postsorted_genome_bam.bam
