Who came first, the chicken or the egg?

 This is an enigma that has plagued humans for centuries to give a correct response to the final.
This question a British scientific team seems to have provided a solution, reports The start notification.

They have explored the processes that lead to the crystallization of calcium carbonate and egg shell formation.

Colin Freeman and colleagues at the University of Warwick and Sheffield have discovered that the protein ovocledidina17 (OC-17) present in the ovaries of hens, is responsible for the processing of calcium carbonate in kristalecalciti substance that constitutes the strongest shell.

Scientists have also discovered that in the absence of this protein, the shell does not harden and therefore can not accommodate a bird.

So, according to scientists, chickens, or rather the OC-17 protein is created before the egg.