Gene targeting vectors - recent reviews?

[Ashok Aiyar]

If you know of a good recent review of various gene knockout 
strategies and gene targeting constructions that have been used 
recently in mammalian cells, could you please direct me to it?

Thanks,
Ashok
-- 
Ashok Aiyar, Ph.D.                    aiyar at ebv.oncology.wisc.edu
Department of Oncology            University of Wisconsin-Madison

"If people are good only because they fear punishment, and hope for 
reward, then we are a sorry lot indeed."    -- Albert Einstein