Script code for formatting the Gencode GTF file for the 10X pipeline: https://support.10xgenomics.com/single-cell-gene-expression/software/release-notes/build#GRCh38_2020A
To obtain a python data structure from a 10x Genomics H5 file, see: https://support.10xgenomics.com/single-cell-gene-expression/software/pipelines/latest/advanced/h5_matrices#data-format
Mouse comprehensive mm10 gff3 annotation file downloaded from: https://www.gencodegenes.org/mouse/release_M10.html