Parton Distributions in Nuclei
  We discuss two topics in this talk. One is a brief overview of nuclear parton distributions, and the other is SU(2)-flavor-symmetry breaking in {\it nuclear} antiquark distributions. First, we show that nuclear structure functions $F_2^A(x)$ could be explained in a $Q^2$ rescaling model with parton recombination effects. Then, nuclear gluon distributions are discussed in this parton model. We point out other interesting distributions for future investigations. Second, $\bar u-\bar d$ distributions in nuclei are discussed in order to shed light on nuclear modification of the $\bar u-\bar d$ distribution. -------------------- * This talk was supported by the Yamada Science Foundation. 
S. Kumano (Department of Physics, Saga University)