Hello Dear MS users,
I want to simulation the below structure by DPD. I have a question about bead type. As you can see in the figure I denoted the groups than should be as beads. My question is about the charged groups( groups that have so3- or nh4-), can I set each o them as individual beads? and what is happening to their charge? are the constructed beads from these groups charged? 
 
Best Regards
Sousa