Upper HN    GLU-  56 - HA    GLU-  56   2.65   1   0.10   0.26                     *
    Upper HA    VAL   87 - HN    SER   88   3.36   1   0.02   0.20                     *
    Upper HN    LYS+  55 - HB2   LYS+  55   3.30   1   0.01   0.24                     *
    Cutoffs: Upper distance limits  :    0.20 A