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Annals of the Rheumatic Diseases logoLink to Annals of the Rheumatic Diseases
. 1999 Nov;58(Suppl 1):I121–I128. doi: 10.1136/ard.58.2008.i121

The role of TNFα and lymphotoxin in demyelinating disease

C Lock, J Oksenberg, L Steinman
PMCID: PMC1766588  PMID: 10577988

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Figure 1  .

Figure 1  

Chip design. A perfect match (PM) and an adjacent mismatch (MM) 25-mer DNA oligonucleotide probe pair is illustrated. The MM oligonucleotide has a single change at position 13. 

Figure 2  .

Figure 2  

Sample preparation. A primer containing oligo-dT (T24) and a T7 RNA polymerase binding site is used for first strand cDNA synthesis. Double stranded cDNA is used for an in vitro transcription reaction, to make cRNA labelled with biotin-UTP and biotin-CTP.

Figure 3  .

Figure 3  

Genechip image. The figure shows a scanned image of a HuGeneFL chip.

Figure 4  .

Figure 4  

Close view of genechip. Individual synthesis features or probe cells can be seen. Each 24 × 24 µm probe cell is imaged by the scanner as a series of 3 µm pixels. The software aligns a grid to the image after scanning. A row of brighter PM probes can be seen, above a row of corresponding MM probes.

Figure 5  .

Figure 5  

Hybridisation. Biotinylated cRNA, stained with streptavidin-phycoerythrin, binds preferentially to the PM oligonucleotide. Hybridisation is measured by calculation of PM-MM differences, and PM/MM ratios. The software makes a call of increased, decreased, or no change for each RNA, when comparing two chips.

Selected References

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