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  1. pdfNational Library of Medicine Informatics Training Conference (June 18-19, 2013) - University of Utah 
    https://www.nlm.nih.gov/ep/documents/TC2013Program.pdf
    ... that share a common ancestor. The difficulty with clonal grouping methods lies in finding biologically accurate criteria ... of multiple sclerosis patients are the result of clonal expansion inside or outside of the brain. Another ...