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Possible Answers: Teeth.
Last seen on: Daily Celebrity Crossword – 9/17/18 Movie Monday
Random information on the term “Teeth”:
Tooth development or odontogenesis is the process in which teeth develop and grow into the mouth. Tooth development varies among species.
In fish, Hox gene expression regulates mechanisms for tooth initiation.[1][2]
However, sharks continuously produce new teeth throughout their lives[3][4][5] via a drastically different mechanism. Shark teeth form from modified scales near the tongue and move outward on the jaw in rows until they are eventually dislodged.[6] Their scales, called dermal denticles, and teeth are homologous organs.[7]
Generally, tooth development in non-human mammals is similar to human tooth development. The variations usually lie in the morphology, number, development timeline, and types of teeth.[8] However, some mammals’ teeth do develop differently than humans’.
In mice, WNT signals are required for the initiation of tooth development.[9][10] Rodents’ teeth continually grow, forcing them to wear down their teeth by gnawing on various materials.[11] If rodents are prevented from gnawing, their teeth eventually puncture the roofs of their mouths. In addition, rodent incisors consist of two halves, known as the crown and root analogues. The labial half is made of enamel and resembles a crown, while the lingual half is made of dentin and resembles a root. The mineral distribution in rodent enamel is different from that of monkeys, dogs, pigs, and humans.[12]