This page demonstrates different modes of consensus processing for MSA Viewer
https://www.ncbi.nlm.nih.gov/projects/msaviewer/?url=data/YP.13.muscle.asn
https://www.ncbi.nlm.nih.gov/projects/msaviewer/?url=data/YP.13.muscle.asn&consensus=true
https://www.ncbi.nlm.nih.gov/projects/msaviewer/?url=data/YP.13.muscle.asn&consensus=false
https://www.ncbi.nlm.nih.gov/projects/msaviewer/?url=data/dengue_cons_prot.asn