  We prove the existence of a one-parameter family of nondisplaceable
Lagrangian tori near a linear chain of Lagrangian 2-spheres in a symplectic
4-manifold. When the symplectic structure is rational we prove that the
deformed Floer cohomology groups of these tori are nontrivial. The proof uses
the idea of toric degeneration to analyze the full potential functions with
bulk deformations of these tori.
