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Mapping 250K/500K SNP assay

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B2 OLIGO PERFORMANCE<br />

chapter 7 | Analysis Workflow 203<br />

The B2 oligo is a component of the Oligo Control Reagent, 0100<br />

(OCR). It is spiked into each hybridization cocktail and is highlighted<br />

on the image by the following:<br />

• The alternating pattern of intensities on the border<br />

• The checkerboard pattern at each corner (Figure 7.10) and<br />

throughout the array<br />

• The array name, located in the lower left corner of the array (Figure<br />

7.11)<br />

Figure 7.10<br />

Example of corner checkerboard pattern<br />

Figure 7.11<br />

Array name (image has been rotated for display)<br />

B2 Oligo serves as a positive hybridization control and is used by the<br />

software to place a grid over the image. Variation in B2 hybridization<br />

intensities across the array is normal and does not indicate variation in<br />

hybridization efficiency.

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