Figure 1From: BBH-LS: an algorithm for computing positional homologs using sequence and gene context similarityGene tree for three gene showing the different types of homologs. The gene tree for three genes g, h, and h' that descended from a single ancestral gene in the most recent common ancestor (MRCA) of genome G and H. Gene g is orthologous to both h and h', but only g and h are positional homologs because h is the direct descendant of the ancestral gene. Genes h and h' are paralogs as they are separated by a duplication event.Back to article page