  We present the first calculations to follow the evolution of all stable
isotopes (and their abundant radioactive progenitors) in a finely zoned stellar
model computed from the onset of central hydrogen burning through explosion as
a Type II supernova. The calculations were performed for a 15 solar mass Pop I
star using the most recently available set of experimental and theoretical
nuclear data, revised opacity tables, and taking into account mass loss due to
stellar winds. We find the approximately solar production of proton-rich
isotopes above a mass number of A=120 due to the gamma-process. We also find a
weak s-process, which along with the gamma-process and explosive helium and
carbon burning, produces nearly solar abundances of almost all nuclei from A=60
to 85. A few modifications of the abundances of heavy nuclei above mass 90 by
the s-process are also noted and discussed. New weak rates lead to significant
alteration of the properties of the presupernova core.
