# Paragraph spacing within minibox

I have tried all kinds of gimmicks, but I am stuck trying to reduce the double-spacing within the minibox to single space. (Obviously, I want to keep the global \onehalfspacing option.) This sounds trivial (and it probably is), but changing \parskip and \linespread seems to only to work for minipage --- I want to change this in a minibox environment --- what am I doing wrong here?

\documentclass{article}

\usepackage{setspace}
\onehalfspacing
\renewcommand{\arraystretch}{1}  % tables smaller spacing
\setlength{\tabcolsep}{5pt}

\usepackage{minibox}   % minipage without specific width

\begin{document}
\section{Immune System}

\newcommand{\belongs}[2] {  % \belongs
\noindent
$\minibox{#1} \left \{ \minibox{#2} \right .$
}

\noindent
\begin{minipage}{0.30\linewidth}
\belongs{antigen\\presenting\\cells}{
Macrophages \\
Dendritic cells \\
B cells}
\end{minipage}
\hfill
\begin{minipage}{0.30\linewidth}
\belongs{humoral\\response}{B cells}
\end{minipage}
\hfill
\begin{minipage}{0.30\linewidth}
\belongs{cell-mediated\\immunity}{
phagocytes \\
killer T cells \\
release of cytokines}
\end{minipage}

\end{document}


minibox is just a one column tabular so you can shrink it vertically with \arraystretch as it has been stretched already by the \onehalfspacing Also, don't leave a space before the % at end of line:

\documentclass{article}

\usepackage{setspace}
\onehalfspacing
\renewcommand{\arraystretch}{1}  % tables smaller spacing
\setlength{\tabcolsep}{5pt}

\usepackage{minibox}   % minipage without specific width

\begin{document}
\section{Immune System}

\newcommand{\belongs}[2] {% \belongs
\noindent
$\renewcommand{\arraystretch}{.7} \minibox{#1} \left \{ \minibox{#2} \right .$%
}

\noindent
\begin{minipage}{0.30\linewidth}
\belongs{antigen\\presenting\\cells}{
Macrophages \\
Dendritic cells \\
B cells}
\end{minipage}
\hfill
\begin{minipage}{0.30\linewidth}
\belongs{humoral\\response}{B cells}
\end{minipage}
\hfill
\begin{minipage}{0.30\linewidth}
\belongs{cell-mediated\\immunity}{
phagocytes \\
killer T cells \\
release of cytokines}
\end{minipage}

\end{document}

• Ah. My bad. The mind fills in the gaps. Erroneously in this case. I'll delete my comment. – Steven B. Segletes Dec 22 '14 at 19:57