Learn about the relationship between the origin of human teeth and sharks?

<p align="right" style=";text-align:left;direction:ltr"><strong>Weather of Arabia</strong> - A recent study conducted by the University of Cambridge, headed by Dr. Andrew Gillis, concluded that the origin of human teeth may be linked to an ancient species of fish called (the primitive shark) <span>.</span></p><p style=";text-align:left;direction:ltr"></p><p style=";text-align:left;direction:ltr"> The study showed that sharks lack the presence of skeletons and have a layer of skin containing scales similar to teeth, called <span>(dermal denticles)</span> . The appearance of this layer is similar to the teeth, and this is no coincidence <span>.</span></p><p style=";text-align:left;direction:ltr"></p><p style=";text-align:left;direction:ltr"> Dr. &quot;Gillis&quot; stated that these layers <span>&quot;dermal denticles&quot;</span> moved during the stage of development, from the skin of primitive fish to the mouth. Which could indicate the possibility of transmission to all vertebrate teeth, starting from cats and dogs until it reached humans <span>.</span></p><p style=";text-align:left;direction:ltr"></p><p style=";text-align:left;direction:ltr"> This new study represents the latest ongoing development in the dental origin debate. The Cambridge research team examined embryos of cartilaginous fish belonging to sharks, according to Russia Today.</p><p style=";text-align:left;direction:ltr"></p><p style=";text-align:left;direction:ltr"> The researchers used fluorescent markers to label different types of cells in the embryos, finding that the <span>&quot;dermal denticles&quot;</span> are created from the same cell type as teeth, known as &quot;neural crest cells <span>&quot;.</span></p><p style=";text-align:left;direction:ltr"></p><p style=";text-align:left;direction:ltr"> Dr. Gillis explained that these cells are central to the process of developing teeth in mammals, pointing out that the results indicate a deep evolutionary relationship between the structures of primitive fish and the teeth of vertebrates.</p><p style=";text-align:left;direction:ltr"></p><p style=";text-align:left;direction:ltr"> It is worth noting that the rough skin of sharks and other cartilaginous species is an evolutionary remnant of the shields that covered fish before jaws evolved about 400 million years ago. Teeth could be another relic of this long history <span>.</span></p><p align="right" style=";text-align:left;direction:ltr"></p>