  An MBM locus on a hyperkahler manifold is the union of all deformations of a
minimal rational curve with negative self-intersection. MBM loci can be
equivalently defined as centers of bimeromorphic contractions. It was shown
that the MBM loci on deformation equivalent hyperkahler manifolds are
diffeomorphic. We determine the MBM loci on a hyperkahler manifold of K3-type
of low dimension using a deformation to a Hilbert scheme of a non-algebraic K3
surface.
