Elephant shark genome small and slow to evolve
By Ashley Yeager, 14:05 PM January 8, 2014
Elephant sharks' DNA hasn't changed much in the 420 million years that bony fishes have been in existence, suggests a new analysis of the animal's genome.
Callorhinchus milii is the first cartilaginous fish to have its genome fully sequenced. At 1 billion base pairs, the elephant shark has the smallest genetic code among sharks, rays and other similar fishes. A closer look at the animal's genome suggests that the fish do not have many bones because they lack genes that switch on calcium-bindin...
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