denylisted genome file

[okeyoallan]

I am working on a project that requires us to test a couple of pipelines and really interested in incorporating this similar pipeline. I am however unaware of what the 'denylisted genome' file would be and its importance in this type of work. Someone help me understand this. thanks.
In addition, the link 'http://gatkforums.broadinstitute.org/gatk/discussion/3892/the-gatk-best-practices-for-variant-calling-on-rnaseq-in-full-detail' to the documentation of the gatk workflow is invalid, kindly work on that as well.