Expander version 4.0 includes the following improvements:
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1)  Ability to load and analyze data in .cel files format.
2)  Missing value estimation using the KNN (K-Nearest Neighbours) algorithm
3)  T-test statistics
4)  Condition merge utility (calculating an average profile from a set of   condition profiles)
5)  Ability to perform log2 operation on the data at the time of the analysis
6)  Ability to run SAMBA and CLICK on large datasets
7)  Improved color scale range control
8)  Symbol auto fill according to gene Ids
9)  Annotation files update
10) Data for Chicken.
11) Expanded promoter analysis range