%dl#similarity{ :style => "display: none;" }
  %dt
    Similarity
    (
    = hide_link "#similarity"
    )
  %dd 
    %code lazar
    calculates 
    %em activity specific
    similarities based on the presence of statistically 
    = toggle_link "#significant_fragments", "significant fragments"
    This procedure will
    %ul
      %li consider only those parts of a chemical structure that are relevant for a particular endpoint
      %li ignore inert parts of the structure
      %li lead to different similarities, depending on the toxic endpoint
    Similarities of 1 may be encountered even for structurally dissimilar compounds, because inert parts are ignored.