Table 3.

Average percentage of G+C content in codons of usp

	Diptera	Lepidoptera	Tribolium	Blattaria
Codons	346	398	283	279
First position	57,5%	59,0%	49,7%	57,9%
Second position	38,7%	42,2%	35,3%	40,4%
Third position	67,5%	72,8%	52,7%	48,9%
All sites	54,6%	58,0%	45,9%	49,1%