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Chip type: miRNA-2_0

> cdf <- AffymetrixCdfFile$byChipType("miRNA-2_0")
> cdf
Path: annotationData/chipTypes/miRNA-2_0
Filename: miRNA-2_0.CDF
Filesize: 6.08MB
Chip type: miRNA-2_0
RAM: 0.00MB
File format: v4 (binary; XDA)
Dimension: 478x478
Number of cells: 228484
Number of units: 20706
Cells per unit: 11.03
Number of QC units: 4

Note that the default CDF provided by Affymetrix is in the text/ASCII file format. It is highly recommended to convert this to the binary/XDA format using convertCdf() of the affxparser package.