I wanted to do experiments on miRNA and its regulatory effects on target oncogene.

miRNA Let7 family (7b in particular) has a negative regulatory effect on the KRAS gene.  I want to prove this premise by transfection.  Would it be efficient to use MCF-7 cells or MB 231?  These are the cells lines we have readily available and I wanted some inputs from those who have had experience with these lines and the KRAS gene. 

Thanks!

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