HI Everybody, 
  I'm a newcomer and so generally not familiar with Bioconductor packages. It made me a little dizzy facing so many packages. So, where and how to start in a smart way, instead of playing arround for too long a time? Are there any redundancies among the packages, or are they completely complimentary?
  I have some real original Affymetrix array data, my basic mission is to open/read the data sets into R, preprocess them, and make comparisons to get significantly changed mRNAs. 
  My background: somewhat familiar with R language environment and some experience at basic stat analysis, but not in array data. 
  Thanks, 
  Hanx (Xianglu Han)
  Depart of Environmental Medicine
  University of Rochester Medical Center
  Rochester, NY 14642
  USA

 		
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