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Describe at least one similarity and one difference between the causative agents of syphilis and yaws.
Ectoderm
The outermost layer of cells or tissue of an embryo in early development, giving rise to the outer layer of skin, nails, hair, and nervous system.
Epiblast
A layer of cells in the early embryo from which all the various tissues and organs of the body will eventually develop.
Neural Plate
An early embryonic structure that gives rise to the central nervous system, including the brain and spinal cord, through the process of neurulation.
Notochord
A flexible rod made of a material similar to cartilage that provides support in the embryonic stages of all chordates.
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