# 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:** 5

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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:** [June 13, 2023, 12:02am UTC](https://help.galaxyproject.org/t/extract-pairwise-maf-blocks-tools-asks-for-maf-source-but-says-no-options-available/10231/5 "2023-06-13T00:02:25Z")

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Hi @igor and @Deuterium09

This topic has recent details about how to use the tool at ORG (or anywhere), including a history link with an example using a **custom maf** from the history (imported from UCSC). Note how the maf and query coordinates both have the same **database** metadata – that is required for this usage. [Attempting to use Stitch MAF blocks tool, but lack of documentation](https://help.galaxyproject.org/t/attempting-to-use-stitch-maf-blocks-tool-but-lack-of-documentation/10091)

Maybe a server indexed **maf** reference is available at other servers? ~~We dropped this at ORG~~. ~~Correction: this is at ORG.~~ The index is present but doesn’t work correctly. It did used to be based on hg19, and the AU server also used it at some point in the past, not sure about now.

**Update!! ORG does have hg19 available. Screenshot** of this shared history → [Galaxy](https://usegalaxy.org/u/jen-galaxyproject/h/copy-of-test-maf-tools-2023). I started it up to provide an example.  
And the job failed. The solution is to do what @igor did and what the history in the other topic did == use a maf from the history.

 ![Screen Shot 2023-06-12 at 5.14.03 PM](https://us1.discourse-cdn.com/flex020/uploads/galaxy/original/2X/3/370a090d419233d41838858816bb290cfcd5fef7.png)

 ![Screen Shot 2023-06-12 at 5.27.17 PM](https://us1.discourse-cdn.com/flex020/uploads/galaxy/original/2X/e/ed30abc9c485e40aab36b31744b8ffe6f6453187.png)

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