I'm using the acronym package but I just realized that it has some problem with spacing. It is the last version (2012). Every time an acronym starts a new line, at the end of the previous line there is a small white space, very annoying to me!

How can I fix this?



Just after (less than \SI{5}{\minute}) exogenous stimuli on a preadipocyte, \ac{CREB} is phosphorylated and 
increase expression of \ac{CEBP}, in particular the two isoforms
\ac{CEBPb} and \ac{CEBPd}. This two transcription factors are inactive, this means that they are not able 
to bind DNA, and thus they accumulate in the cytosol. 
During the passage from G1 to S phase of cell cycle, \ac{CEBPb} is hyperphosphorylated and activated by
\ac{GSK3b} and \ac{MAPK}. Phosphorylation allow \ac{CEBPb} to homodimerize and to bind DNA, starting
mitotic clonal expansion of preadipocyte.
Subsequently \ac{CEBPb} and \ac{CEBPd} induce expression of \ac{CEBPa} and \ac{PPARg},
the two main transcription factor for adipocyte development.\ac{PPARg} dimerize with \ac{RXR}, thus being activated. 
Once both \ac{PPARg} and \ac{CEBPa} are activated they regulate each other, maintaining high expression 
levels and decreasing the ones of \ac{CEBPb} and \ac{CEBPd} (see \figurename{} 

\acro{CEBP}[C/EBP]{CCAAT/enhancer binding protein}
\acro{CEBPa}[C/EBP\textalpha]{CCAAT/\-en\-hanc\-er binding protein alpha}
\acro{CEBPb}[C/EBP\textbeta]{CCAAT/\-en\-hanc\-er binding protein beta}
\acro{CEBPd}[C/EBP\textdelta]{CCAAT/\-en\-hanc\-er binding protein delta}
\acro{PPARg}[PPAR\textgamma]{peroxisome pro\-life\-rator-activated receptor gamma}
\acro{MSC}{mesenchimal stem cell}
\acro{RXR}{retinoid X receptor}
\acro{GSK3b}[GSK3\textbeta]{glycogen synthase kinase-3 beta}
\acro{MAPK}{mitogen-activated protein kinase}
\acro{CREB}{cyclic AMP response element-binding protein}


Problem with right margin

  • 1
    Welcome to TeX.sx! Could you please post a minimal working example (MWE) demonstrating the problem?
    – cgnieder
    Jun 23, 2013 at 15:39
  • unfortunately I cannot post a picture of the result!
    – Stefano_g
    Jun 23, 2013 at 15:45
  • You might consider using the glossaries package instead. In my question tex.stackexchange.com/questions/120677/restore-headings-section I posted a minimal example. Jun 23, 2013 at 15:47
  • 1
    @Stefano_g the easiest way: load the etoolbox package and then add (between \makeatletter and \makeatother twice \patchcmd\@acf{\hskip\z@}{}{}{}. This will remove both occurrences of \hskip\z@ where in this case the second one is the important one.
    – cgnieder
    Jun 23, 2013 at 17:08
  • 1
    Great!!! It works! Thanks a lot! @cgnieder you should answer it officially!
    – Stefano_g
    Jun 23, 2013 at 17:11

1 Answer 1


from the comments:

It seems that acronym introduced \hskip\z@ in the definition of \@acf as „fix for non hyphenation of first word in long form“ in v1.37. This seems to be the cause of the spurious space. Indeed, removing it by saying


gives the correct output again. The \hskip\z@ needs to be removed twice as the first one is used in the footnote version of the long form and only the second one in the default appearance:

% definition of \@acf in v1.38:
          \nolinebreak[3] %

You might want to treat \@acfp the same way - it contains the same two instances of \hskip\z@.

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