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\begin{table}[tbp]
  \caption{Examples of keywords from the category gazetteer}
  \begin{center}
    \begin{tabular}[t]{l|c|c|c}
      \hhline{====}
      Category: & 
      \emph{Genetics} & \emph{News} & \emph{Address Information}\\
      \hhline{----}
      Keywords: &
      \begin{tabular}[t]{l}
        Genetics \\
        genetic \\
        bioinformatic \\
        bioinformatics \\
        arabidopsis \\
        protein \\
        proteins \\
        RNA \\
        DNA \\
        MeSH\\
      \end{tabular}
      &
      \begin{tabular}[t]{l}
        News \\
        current events\\
      \end{tabular}
      &
      \begin{tabular}[t]{l}
        Address Information\\
        Address\\
        Addresses\\
        Addressing\\
        postcode\\
        zip code\\
        phone\\
        telephone\\
      \end{tabular}
      \\
      \hhline{====}
    \end{tabular}
  \end{center}
  \label{tab:gazetteer}
\end{table}
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