I am using the mouse index from https://github.com/pachterlab/kallisto-transcriptome-indices/releases to run kallisto. I would also like to run kallisto genomebam to get the bam files. The gtf file is included in the link where I got the index. However, i cannot figure out where to get the --chromosomes file. I know it is just recommended and not required but I would prefer to use it. Where can I find it though?