  We consider local bifurcations of equilibria in dynamical systems arising
from chemical reaction networks with mass action kinetics. In particular, given
any mass action network admitting a local bifurcation of equilibria, assuming
only a general transversality condition, we list some enlargements of the
network which preserve its capacity for the bifurcation. These results allow us
to identify bifurcations in reaction networks from examination of their
subnetworks, extending and complementing previous results on the inheritance of
nontrivial dynamical behaviours amongst mass action networks. A number of
examples are presented to illustrate applicability of the results.
