Original sentence: The subunits all share a common topology, possessing two plasma membrane spanning domains, a large extracellular loop and intracellular carboxyl and amino termini.This view was recently confirmed by the use of X-ray crystallography to resolve the three-dimensional structure of the zebrafish P2X4 receptor
Edited sentence: The subunits all share a common topology, possessing two plasma membrane spanning domains, a large extracellular loop and intracellular carboxyl and amino termini (Figure 1).This view was recently confirmed by the use of X-ray crystallography to resolve the three-dimensional structure of the zebrafish P2X4 receptor (Figure 2)