(A) The forward particle passing procedure. The particles of two duplicates a and b are passed to infer their ancestral particle x. (B) The backward particle passing procedure. The ancestral particle x and particle of one duplicate a are passed to infer the other duplicate b.
Zeng and Hannenhalli BMC Genomics 2013 14(Suppl 1):S15 doi:10.1186/1471-2164-14-S1-S15