Cytokinesis

With the exception of higher plants, the division of the cell is brought about by a contractile ring made of actin and myosin

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An anterior-to-posterior gradient of Bicoid protein

An anterior-to-posterior gradient of Hunchback protein

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A posterior-to-anterior gradient of Nanos protein A posterior-to-anterior gradient of Caudal protein

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A third set of maternal genes whose proteins generate the unsegmented extremities of the anterior-posterior axis: the acron (the terminal portion of the head that includes the brain) and the telson (tail).

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The boundaries of the acron and telson are defined by the product of the torso gene, which is activated at the

tips of the embryo.

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