\begin{tikzpicture}[dia/.style={text centered, draw, align=center, inner sep=2mm, minimum height=1.5cm, rounded corners=0.2cm}, font=\sffamily]
    \footnotesize
    \node (ingest) {POD5};
    \node[dia, right=7mm of ingest] (preprocessing) {Preprocessing};
    \node[dia, right=7mm of preprocessing] (basecall) {Basecalling};
    \node[dia, right=7mm of basecall] (processing) {Additional \\ processing};
    \node[dia, right=7mm of processing] (postprocessing) {Sequence \\ post-processing};
    \node[right=7mm of postprocessing] (out) {Output};

    \draw[-Latex] (ingest) -- (preprocessing);
    \draw[-Latex] (preprocessing) -- (basecall);
    \draw[-Latex] (basecall) -- (processing);
    \draw[-Latex] (processing) -- (postprocessing);
    \draw[-Latex] (postprocessing) -- (out);
\end{tikzpicture}