We use nCTEQ15 nPDFs with uncertainties to identify measurements which
have 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, for
example), this information can also help improve proton PDFs.