Analysis of gorilla-specific Alu subfamilies. (A) A schematic diagram of a tree of evolutionary relationships of the four genera in Family Hominidae (great apes) based on divergence dates of 6 to 9 million years ago for the Gorilla-Homo/Pan speciation event [28, 53–55]. (B) A pie chart showing a color-coded distribution of Gorilla-specific Alu Y subfamilies. Alu Y_Gorilla is the largest subfamily, representing slightly less than three-fourths of the total copy number identified. (C) A stepwise analysis of the relationships between Gorilla-specific Alu Y subfamilies generated from a Network analysis of the consensus sequences for each subfamily. The color of the dots representing each subfamily are correlated with the colors in the pie chart in Figure 1B.