> For the complete documentation index, see [llms.txt](https://knowledge.illumina.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://knowledge.illumina.com/library-preparation/rna-library-prep/library-preparation-rna-library-prep-faq-list/000009893.md).

# Index and UMI information for the Illumina miRNA prep kit

**What are the sequences of the indexes?**

* This kit uses indexes that are unique to this library prep kit: Illumina miRNA UD Indexes. Sequences can be found in the [Adapter Sequences Document](https://support.illumina.com/downloads/illumina-adapter-sequences-document-1000000002694.html). Illumina sells 4 x 96 plates: A, B, C, D.
* Note: Other Illumina index sets, including the Illumina DNA/RNA UD Indexes (v3) indexes, are not compatible with the Illumina miRNA library prep kit.

**Are the UMI random? If not, are the sequences available?**

* UMIs are random, therefore sequences are not provided.

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| *For any feedback or questions regarding this article (Illumina Knowledge Article #9893), contact Illumina Technical Support* [*techsupport@illumina.com*](mailto:techsupport@illumina.com?subject=Question%2FFeedback%20Regarding%20Illumina%20Knowledge%20Article%20#000009893%20-%20Library%20Preparation%20\&body=Dear%20Illumina%20Technical%20Support,%0D%0A%0D%0A)*.* |


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