I have the following code that defines a single frame of a beamer
presentation:
\begin{frame}{Focus on Merkel Cells}
\begin{itemize}
\item \textbf{1875}: Merkel cells discovered by Friedrich Merkel
\item \textbf{1969}: Merkel cell-neurite complexes implicated in
touch reception
\item \textbf{1969-2014}: Unresolved debate
\begin{enumerate}
\item A$\beta$ SAI neurons are mechanoreceptive (analagous to
olfaction and all other LTMRs)
\item Merkel cells are mechanoreceptive (analagous to taste and
hearing)
\item \alert{\textbf{Both are mechanoreceptive: A$\beta$ SAI rapid, Merkel
sustained}}
\end{enumerate}
\item \textbf{2014}: Explosion of new evidence
\end{itemize}
\end{frame}
I want to draw an empty black circle around the text A$\beta$ SAI rapid,
and I don't care whether other text gets covered up. How can I do this?
Best Answer
Here's an option using TikZ and its
tikzmark
andfit
librariesThe result (compile two or three times to the circle to reach its final position):
Since TikZ and
beamer
cooperate, you can use overlays as in, for example,so the circle will appear on the second slide.
Using an ellipse (requires the
shapes.geometric
library):