  We examine the properties of 4-d bosonic and fermionic (mesons and mesinos)
modes on $D7$-branes wrapped over Kuperstein 4-cycle of the Klebanov-Strassler
background. The wave equations are derived in a convenient parameterization of
the warped deformed conifold metric. The mass spectra, wave functions and
couplings of bosonic modes are evaluated by means of semi-classical tools. We
explore the possible existence of fermionic zero modes.
