Signal sequences

contain one or more positively charged amino acids adjacent to a continuous stretch of 6–12 hydrophobic residues (known as the hydrophobic core)

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#Unit 5. Developmental Biology

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

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#Unit 5. Developmental Biology

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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#Unit 5. Developmental Biology

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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#Unit 5. Developmental Biology

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#Unit 5. Developmental Biology

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#Unit 5. Developmental Biology