  Red giant stars, both in the field and in globular clusters, present
abundance anomalies that can not be explained by standard stellar evolution
models. Some of these peculiarities clearly point towards the existence of
extra-mixing processes at play inside the stars, the nature of which remains
unclear. We present new results of the evolution of a typical globular cluster
red giant including a fully consistent treatment of rotation-induced mixing
from the ZAMS up to the RGB tip. The uncertainties pertaining to the
prescriptions of angular momentum and chemicals transport inside the star are
discussed.
