> 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/general/library-preparation-general-faq-list/000008386.md).
# Sequences and plate positions for the Illumina Unique Dual Indexes, LT (48 Indexes, 48 Samples)
The Illumina Unique Dual Indexes, LT (48 Indexes, 48 Samples), catalog 20098166, are used with the following Illumina library prep kits:
* Illumina Microbial Amplicon Prep (IMAP) (cat 20097857)
* Illumina Microbial Amplicon Prep - Influenza A/B (IMAP-Flu) (cat 20106305)
* Illumina 5-Base DNA Prep
* Illumina 5-Base DNA Prep with Enrichment
The plate layout can be found in the [Adapter Sequences Document](https://support.illumina.com/downloads/illumina-adapter-sequences-document-1000000002694.html) (rather than the Index Adapters Pooling Guide). Columns 1 and 6 are from IDT for Illumina DNA/RNA UD Indexes set D (cat 20042667), and columns 2-5 are from set B (cat 20027214):
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| :--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------: |
| *For any feedback or questions regarding this article (Illumina Knowledge Article #8386), contact Illumina Technical Support* [*techsupport@illumina.com*](mailto:techsupport@illumina.com?subject=Question%2FFeedback%20Regarding%20Illumina%20Knowledge%20Article%20#000008386%20-%20Library%20Preparation%20\&body=Dear%20Illumina%20Technical%20Support,%0D%0A%0D%0A)*.* |
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