Refer to the figure, which shows a phylogenetic tree of the engrailed gene family. 
Which gene is the same evolutionary distance from zebrafish En1b as is zebrafish En2b?
Definitions:
Dynamic Systems Theory
A framework describing motor skills as resulting from ongoing interactions among physical, cognitive, and socioemotional influences and environmental supports; previously mastered skills are combined to provide more complex and effective ways of exploring and controlling the environment.
Skill Milestones
Describes significant developmental achievements in a person's life, marking progress in areas such as motor skills, language acquisition, and cognitive development.
Cross Cultural Influences
The impact that differing cultural backgrounds and practices have on various aspects of human behavior, communication, and interaction.
Voluntary Reaching
A developmental milestone where infants intentionally extend their arm and hand towards an object to grasp it.
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