Post Thumb

World Economic Forum

Share it

Whereas placodes in avian and mammalian embryos last long enough that they are easy to see, reptilian placodes exist for a brief period of about 12 hours, and pop up on different locations depending on the species.

Dr. Milinkovitch and his team did not originally set out to find placodes in reptiles; rather they were investigating why certain bearded dragons are born without scales.

By analyzing the genomes of the naked bearded dragons, they narrowed down the culprit to a mutation in a single gene, called EDA, which is also known to disrupt placode development in birds and mammals.

“There must be a link here because this guy doesn’t have scales, and in birds and mammals when that gene is mutated they don’t have hair or feathers.” The clue got the team thinking that maybe reptiles need placodes to make scales and led them to search the microanatomy of reptilian embryos. “When we investigated normal snakes, normal crocodiles and normal lizards we found placodes everywhere,” Dr. Milinkovitch said.

Their findings unite birds, mammals and reptiles as descendants from the same lineage of ancient reptilian creatures that first developed placodes.


Article originally posted at

Post Author: Carla Parsons

2 thoughts on “World Economic Forum

    Alan Powell

    (October 29, 2017 - 5:07 am)

    Maybe I’ll live in a pretend virtual world and ride my flying pink unicorn to my imaginary office where I have super crime fighting powers…

    Emmerson Jespersen

    (October 29, 2017 - 5:07 am)

    There is still no reason to have self driving cars the future will be or railed pod systems

Leave a Reply

Your email address will not be published. Required fields are marked *