# Extracting MAF blocks from regions of the human GRCh38/hg38 assembly

**URL:** <https://help.galaxyproject.org/t/extracting-maf-blocks-from-regions-of-the-human-grch38-hg38-assembly/2044>\
**Category:** Uncategorized\
**Tags:** maf-manipulations\
**Created:** [September 4, 2019, 6:36pm UTC](https://help.galaxyproject.org/t/extracting-maf-blocks-from-regions-of-the-human-grch38-hg38-assembly/2044 "2019-09-04T18:36:29Z")\
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**Author:** ![ccasola](https://avatars.discourse-cdn.com/v4/letter/c/8797f3/32.png) [@ccasola](https://help.galaxyproject.org/u/ccasola)\
**Post date:** [September 4, 2019, 6:36pm UTC](https://help.galaxyproject.org/t/extracting-maf-blocks-from-regions-of-the-human-grch38-hg38-assembly/2044/1 "2019-09-04T18:36:29Z")

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Hi, when I tried to extract MAF blocks from a set of regions of the human 2013 GRCh38/hg38 assembly, the message “No options available” popped out under ‘Choose species’. This operation works on the 2009 assembly GRCh37/hg19. However, if I send MAF alignments from the UCSC Table Browser using the 2013 GRCh38/hg38 assembly, I can actually join them and choose species! But, these are whole alignments, not blocks, so it doesn’t help getting MAF blocks of specific regions, ie exons.  
It would be great if the MAF blocks from the GRCh38/hg38 assembly could be extracted directly from genome coordinates of that assembly. I hope this can be fixed soon.  
Thanks!

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