Statistically significant at P B TamR MCF 7 cells were exposed to 4OHTam, О±6 integrin blocking antibody GoH3, AF or GoH3 in combination with 4OHTam or AF before cell viability was assessed using the Alamar Blue assay as described in Materials and Methods <a href=http://nolvadex.mom>tamoxifen</a> pLX sgRNA was a kind gift from Eric Lander David Sabatini Addgene plasmid 50662