Coexpressed gene networks in ATTED-II are drawn based on rank of correlation. Use of correlation rank partially normalizes the density of genes in correlation space.

Correlation rank is asymmetric, namely the rank of gene B from gene A is not the same as the rank of gene A from gene B. Thus, the geometric averaged rank is used.
AveRank(AB) = √ (Rank(A→B) x Rank(B→A))

For drawing coexpressed gene network of a functional category, the genes for the networks are first selected.

1. Select pair of the genes that are most strongly correlated in the functional category.
2. Add the pair of genes to drawing gene list.
3. Stop to extract genes in following cases.
   
   
   • When the AveRank between the pair of genes are larger than 50.
   • When the number of non-redundant genes in drawing gene list reaches 15.
     In each step of the gene extractions, the number of genes in the drawing gene list increase 0, 1 or 2. Thus in some cases, the number of genes in the drawing gene list could be 16.
4. Back to the step 1.

Genes in MF:0004190 is shown in this table. They are sorted for their AveRank.

After the extraction of genes, all relationships in the drawing gene list are drawn according to the following thresholds;