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Morphogen
Diffusable molecule capable of induction of spatial patterning.
Bicoid
Deposited at anterior end by Mothers nurse cell, transcription factor 1st for neuroectoderm patterning.
Hunchback
Synthesis induced by bicoid forming concentration gradient.
Gap genes
Bicoid and Hunchback combine to activate in a threshold dependent manner.
Pair-rule genes
Hunchback and Gap genes combine, reiterated strips, eve and ftz are examples.
Hox genes
Assign segment identity, selector genes, all preceding genes contribute to selection.
Ubx
Mutation results in repeat of 2nd thoracic segment in drosophila.
