%% 
%%  The LaTeX Graphics Companion, 2ed (first printing May 2007)
%% 
%%  Example 8-3-9 on page 554.
%% 
%%  Copyright (C) 2007 Michel Goossens, Frank Mittelbach, Denis Roegel, Sebastian Rahtz, Herbert Vo\ss 
%% 
%%  It may be distributed and/or modified under the conditions
%%  of the LaTeX Project Public License, either version 1.3
%%  of this license or (at your option) any later version.
%% 
%%  See http://www.latex-project.org/lppl.txt for details.
%% 

\documentclass{ttctexagray}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{348.0pt}

\StartShownPreambleCommands
\usepackage[]{textopo}
\StopShownPreambleCommands
\begin{document}
\begin{textopo}
\sequence{%
  MNTSAPPAVS PNITVLAPGK GPWQVAFIGI TTGLLSLATV
  TGNLLVLISF KVNTELKTVN NYFLLSLACA DLIIGTFSMN
  LYTTYLLMGH WALGTLACDL WLALDYVASN ASVMNLLLIS
  FDRYFSVTRP LSYRAKRTPR RAALMIGLAW LVSFVLWAPA
  ILFWQYLVGE RTVLAGQCYI QFLSQPIITF GTAMAAFYLP
  VTVMCTLYWR IYRETENRAR ELAALQGSET PGKGGGSSSS
  SERSQPGAEG SPETPPGRCC RCCRAPRLLQ AYSWKEEEEE
  DEGSMESLTS SEGEEPGSEV VIKMPMVDPE AQAPTKQPPR
  SSPNTVKRPT KKGRDRAGKG QKPRGKEQLA KRKTFSLVKE
  KKAARTLSAI LLAFILTWTP YNIMVLVSTF CKDCVPETLW
  ELGYWLCYVN STINPMCYAL CNKAFRDTFR LLLLCRWDKR
  RWRKIPKRPG SVHRTPSRQC}

% position of the membrane regions
\MRs{25..47,62..82,100..121,142..164,187..209,367..387,402..421}
\Nterm{extra}% sets N-terminus

\loopfoot{5}{left[10]}% foot at 5th loop turns left after 10 residues
\loopextent{12}% maximum number of residues in straight sections of loop
\loopextent[C]{26}% for C-termini loop set to 26
\scaletopo{+1}
\labelstyle{black}{circ}{Black}{Black}{White}{}
\labelregion[E,7]{210..219}{black}{`neck'}
\labelregion[W,7]{237[NW]..248[SW]}{black}{`loopextent'}
\hidelegend
\end{textopo}
\end{document}