# Infinium genotyping manifest column headings

**IlmnID**: Provides a summary of the pertinent information about the SNP or Indel probe. Genome Build is zero if unknown. For indels, Plus/Minus is reported instead of Top/Bot. See diagram below:

![](https://761066130-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FGM9W2DuBTgEXv1ClCm8H%2Fuploads%2Fgit-blob-ff8239c6417afefb9c720118fb7bf66d5f94ad33%2Fimage1.png?alt=media\&token=0b27c5d3-0e03-43ee-a03f-57125ce55ae6)

**ILMN Strand**: The Top/Bot (for SNPs) or Plus/Minus (for Indels) designation of the ILMN strand (Design strand).

**SNP**: SNP alleles as reported by assay probes. Alleles on the Design strand (the ILMN strand) are listed in order of Allele A/B.

**AddressA\_ID**: For Infinium I bead types, this is the Address ID for the probe specific for the A allele. For Infinium II bead types, the Address ID for the probe used for both A and B alleles (in this case, AddressB\_ID and AlleleB\_ProbeSeq columns are empty).

**AlleleA\_ProbeSeq**: The sequence of the probe identified in AddressA\_ID column.

**AddressB\_ID**: For Infinium I bead types, the address ID for the probe specific for the B allele.

**AlleleB\_ProbeSeq**: For Infinium I bead types, the sequence of the probe identified in AddressB\_ID column.

**GenomeBuild**: The NCBI Genome Build referenced for information about this probe in this manifest.

**Chr**: Chromosome containing the SNP.

**MapInfo**: Chromosomal coordinates of the SNP.

**Ploidy**: Ploidy of the target organism. For humans, autosomes are diploid, mitochondria and Y chromosome are monoploid.

**Species**: Species targeted by the probes in this BeadArray.

**Source**: The database source of the SNP, if available (eg, dbSNP).

**SourceVersion**: The database (Source) version, if available, which was referenced for the SNP to create the manifest.

**Source Strand**: The Top/Bot (for SNPs) or Plus/Minus (for Indels) designation for the Source strand.

**Source Seq**: The sequence of the Source strand.

**TopGenomicSeq** (in \*.csv version of manifest, but not in \*.bpm): The sequence of the Top strand (for SNPs) or the Plus strand (for Indels).

**BeadSetID**: An identifier used in the manufacture of BeadChips.

**Exp\_Clusters**: The number of clusters expected to be generated by each SNP: 1 for nonpolymorphic probes, 2 for mitochondrial DNA and Y chromosome loci, 3 for any other loci for a diploid organism.

**Ref Strand**: Plus/Minus (+/-) designation for the ILMN strand.

For more information on strand designations, refer to the following technical bulletins:

* [DNA strand designations](https://support.illumina.com/bulletins/2016/06/dna-strand-designations-.html)
* [Simple guidelines for identifying top/bottom (TOP/BOT) strand and A/B allele](https://support.illumina.com/bulletins/2016/06/simple-guidelines-for-identifying-topbottom-topbot-strand-and-ab-allele.html)

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