> 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/microarray/general/microarray-general-reference_material-list/000008063.md).

# Strand designations in Infinium Genotyping Manifests Support Webinar

This support webinar explains the various strand types and nomenclature conventions used in Illumina Infinium genotyping manifest files. It covers how strand information is represented and interpreted during genotyping analysis, the relationships between different strand and allele designation systems, and their importance for data interpretation and assay design. The webinar also provides guidance on understanding and converting between common strand designation formats.

Topics covered:

* Understanding Illumina's TOP/BOT strand designation and Genotype A/Genotype B allele designations
* Defining the strand and allele designations used in Infinium Genotyping BeadChip Manifests and understanding how they relate to various genotype report formats
* Explaining the rationale behind the development of Illumina's strand and allele designation systems
* Demonstrating how to convert alleles reported from one strand designation to alleles based on the TOP/BOT designation.

Link to the webinar:

{% embed url="<https://www.youtube.com/watch?v=L96_y1_w-_s&ab_channel=Illumina>" %}

Webinar duration: 42:32 min

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| *For any feedback or questions regarding this article (Illumina Knowledge Article #8063), contact Illumina Technical Support* [*techsupport@illumina.com*](mailto:techsupport@illumina.com?subject=Question%2FFeedback%20Regarding%20Illumina%20Knowledge%20Article%20#000008063%20-%20Microarray%20\&body=Dear%20Illumina%20Technical%20Support,%0D%0A%0D%0A)*.* |


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