# Extract pairwise maf blocks tools asks for maf source but says 'no options available'

**URL:** <https://help.galaxyproject.org/t/extract-pairwise-maf-blocks-tools-asks-for-maf-source-but-says-no-options-available/10231>\
**Category:** usegalaxy.org support\
**Tags:** maf-manipulations\
**Created:** [June 10, 2023, 10:01am UTC](https://help.galaxyproject.org/t/extract-pairwise-maf-blocks-tools-asks-for-maf-source-but-says-no-options-available/10231 "2023-06-10T10:01:55Z")\
**Posts on this page:** 1\
**Showing post:** 7

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**Author:** ![jennaj](https://sea2.discourse-cdn.com/flex020/user_avatar/help.galaxyproject.org/jennaj/32/27_2.png) [@jennaj](https://help.galaxyproject.org/u/jennaj)\
**Post date:** [April 18, 2026, 12:31am UTC](https://help.galaxyproject.org/t/extract-pairwise-maf-blocks-tools-asks-for-maf-source-but-says-no-options-available/10231/7 "2026-04-18T00:31:52Z")

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2026 Update! Remember to get your `maf` source from UCSC, everything else is the same as described here → [MAF manipulation tools in Galaxy: step by step publication with an example shared history](https://help.galaxyproject.org/t/10091/)

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_[View the full topic](https://help.galaxyproject.org/t/extract-pairwise-maf-blocks-tools-asks-for-maf-source-but-says-no-options-available/10231)._