We use nCTEQ15 nPDFs with uncertainties to identify measurements whichhave a potential impact on nuclear corrections and flavor　differentiation. In particular, recent LHC W/Z vector boson production　data in proton-lead and lead-lead collisions are quite sensitive to　heavier flavors (especially the strange PDF). This complements the　information from neutrino-DIS data. As the proton flavor determination　is dependent on nuclear corrections (from heavy target DIS, forexample), this information can also help improve proton PDFs.