> 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-reference_material-list/000002337.md).
# Plate layout for TruSeq Unique Dual (UD) indexes
The following table depicts the plate layout for IDT for Illumina-TruSeq DNA UD Indexes (96 Indexes, 96 Samples), catalog number 20022370, and IDT for Illumina-TruSeq RNA UD Indexes (96 Indexes, 96 Samples), catalog number 20022371.
The following table depicts the plate layout for IDT for Illumina-TruSeq DNA UD Indexes (24 Indexes, 96 Samples), catalog number 20020590, and IDT for Illumina-TruSeq RNA UD Indexes (24 Indexes, 96 Samples), catalog number 20020591.
The Index Adapters Pooling Guide, linked [here](https://support.illumina.com/downloads/index-adapters-pooling-guide-1000000041074.html), contains this table along with recommended index combinations for low-plexity library pooling.
**Note**: The orange boxing in the images above illustrates possible low-plex pooling options. See the Index Adapters Pooling Guide, linked above, for more information.\
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