Forehead Teeth in Ratfish Reveal Evolution of Vertebrate Teeth
Male spotted ratfish grow a row of hooked teeth on a forehead structure called a tenaculum, expressing shh, bmp4 and runx2 genes as oral teeth. The finding was published in PNAS. getnews.me/forehead-teeth-in-ratfis... #ratfish #tenaculum #toothevolution
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