\documentclass[a4paper]{book}
\usepackage{dnaseq} 
 \begin{document}
\noindent\begin{minipage}{100pt}

\noindent\rule{\textwidth}{.5pt}
\DNA!  ACGT'{red}A CGT'{white}TGCA'{green}x s df'{white}FJKD SLAF
DSAIOFDSA ACGT'{red}ACGT'{white}TGCA'{green}x sdf '{white}FJKDSLAF
DSAIOFDSA AC GT'{red}ACGT'{white}TG CA'{green}xsdf'{white}FJKD SLAF
DSAIOFDSA ACGT'{red}ACGT'{white}T GCA'{green} xs df'{white}FJKDSLA
FDSAIOFDSA ACGT'{red}AC GT'{white}TGCA'{green}xsdf'{white}FJK DSLA
FDSAIOFDSA !
\end{minipage}

\noindent\begin{minipage}{200pt}
\noindent\rule{\textwidth}{.5pt}
\DNA!  ACGT'{red}A CGT'{white}TGCA'{green}x s df'{white}FJKD SLAF
DSAIOFDSA ACGT'{red}ACGT'{white}TGCA'{green}x sdf '{white}FJKDSLAF
DSAIOFDSA AC GT'{red}ACGT'{white}TG CA'{green}xsdf'{white}FJKD SLAF
DSAIOFDSA ACGT'{red}ACGT'{white}T GCA'{green} xs df'{white}FJKDSLA
FDSAIOFDSA ACGT'{red}AC GT'{white}TGCA'{green}xsdf'{white}FJK DSLA
FDSAIOFDSA !
\end{minipage}

\noindent\begin{minipage}{\textwidth}
\noindent\rule{\textwidth}{.5pt}
\DNA!  ACGT'{red}A CGT'{white}TGCA'{green}x s df'{white}FJKD SLAF
DSAIOFDSA ACGT'{red}ACGT'{white}TGCA'{green}x sdf '{white}FJKDSLAF
DSAIOFDSA AC GT'{red}ACGT'{white}TG CA'{green}xsdf'{white}FJKD SLAF
DSAIOFDSA ACGT'{red}ACGT'{white}T GCA'{green} xs df'{white}FJKDSLA
FDSAIOFDSA ACGT'{red}AC GT'{white}TGCA'{green}xsdf'{white}FJK DSLA
FDSAIOFDSA !
\end{minipage}
\end{document}

