 It’s been postulated that "Krüppel" inhibits "eve" expression to create the posterior boundary of "eve" stripe two, and evidence has also been found for "Krüppel" being a player specifically in the formation of "hairy" stripe 7.The expression patterns of pair rule gene will in turn regulate the segment polarity genes, making "Krüppel" essential for proper development along the anterior posterior axis and segment identity.