Hello everyone,

I have to analyse data from Affymetrix microarray (Human Genome U133 Plus 2.0 Array) with Bioconductor and it is the first time I am using Bioconductor. I got .cel files from NCBI GEO but I could not get the chip description file. So, how I can obtain a CDF?

And one more thing, when I check number of genes in my dataset, the R program shows that it contains 54,675 genes. However; this number should be between 20,000 - 25,000. So, I am wondering that there might be any replica of them?

Any suggestions and someone can help please?

Thanks,

Hasan