Chicken appeared before eggs

The answer to the eternal question "What appeared before a chicken or an egg" could give British scientists from the universities of Sheffield and Warwick. They are sure: the chicken appeared earlier, as RIA Novosti reports with reference to the British edition.

These craftsmen on the computer modeled the process of formation of eggshell. It turns out that the shell is formed under the influence of a special protein - ovokledinin-17, which is produced in the ovaries of chickens, emphasizes.
This protein plays the role of a catalyst for the development of egg shells, helping to convert calcium carbonate to calcite crystals.

PS How now to solve the riddle "Where did the chicken come from"?