Figure 7. PageRank proximity 
plane diagrams for different species in comparison with Homo sapiens: 
-axis shows PageRank index 
of a word 
and 
-axis shows PageRank index of the same word 
with 
of bull, 
of dog, 
of elephant and 
of zebrafish; here the word length is 
.
The colors of symbols marks the purine content in a word 
(fractions of letters 
or 
in any order); the color varies from red at maximal content, via brown, yellow, green, light blue, to blue at minimal zero content.