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Use the masked FASTA version as the db.
depending on what you have in mind, you might want to filter low complexity regions as well. e.g., dustmasker https://www.ncbi.nlm.nih.gov/IEB/ToolBox/CPP_DOC/lxr/source/src/app/dustmasker/
I'm using locally the human genomic database. I would like to have only the human genomic contig sequences with NT _ #### Accessions or CM_#####