[BioC] time series analysis

[Ozge Gursoy-Yuzugulu]

Hello,

I am working on 2 isogenic cell lines which are treated with a 
certain chemical and 24h, 48h, and 72 hour samples are taken. We now 
have 12 arrays (4x 3 time points) and its duplicate. I searched for 
some methods for the analysis of this kind of data, yet I could not 
find one.

Could you please advise me the most convenient R package and 
statistical method to perform such an analysis...

Thank you all,

Ozge