Presupernova evolution and explosive nucleosynthesis in massive stars for main-sequence masses from 13 $M_odot$ to 70 $M_odot$ are calculated. We examine the dependence of the supernova yields on the stellar mass, $^{12}C(alpha, gamma) ^{16}O}$ rate, and explosion energy. The supernova yields integrated over the initial mass function are compared with the solar abundances.
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