  A spectral sequence is established, whose $E_{2}$ page is Bar-Natan's variant
of Khovanov homology and which abuts to a deformation of instanton homology for
knots and links. This spectral sequence arises as a specialization of a
spectral sequence whose $E_{2}$ page is a characteristic-2 version of $F_{5}$
homology, in Khovanov's classification.
