  A spectral sequence is established, from Bar-Natan's variant of Khovanov
homology to a deformation of instanton homology for knots and links. This
spectral sequence arises as a specialization of a spectral sequence from a
characteristic-2 version of $F_5$ homology, in Khovanov'sclassification.
Concordance invariants of knots are derived from the corresponding instanton
homology groups, including a 1-parameter family of homomorphisms $f_r$ from the
concordance group to the reals, having the potential to provide independent
bounds on the genus and number of double points for immersed surfaces with
boundary a given knot.
