  We present the CTEQ6HQ parton distribution set which is determined in the
general variable flavor number scheme which incorporates heavy flavor mass
effects; hence, this set provides advantages for precision observables which
are sensitive to charm and bottom quark masses. We describe the analysis
procedure, examine the predominant features of the new distributions, and
compare with previous distributions. We also examine the uncertainties of the
strange quark distribution and how the the recent NuTeV dimuon data constrains
this quantity.
