  Let S be a finite graph and G be the corresponding free partially commutative
group. In this paper we study subgroups generated by vertices of the graph S,
which we call canonical parabolic subgroups. A natural extension of the
definition leads to canonical quasiparabolic subgroups. It is shown that the
centralisers of subsets of G are the conjugates of canonical quasiparabolic
centralisers satisfying certain graph theoretic conditions.
