Before revision: Though the problem of pattern formation in biological systems has been studied  more than sixty years, it is from the beginning of this cen- tury that the synergy between theoretical and experimental researchers are depicting the ins and outs of this problem.
After revision: Though the problem of pattern formation in biological systems has been studied more than sixty years, it is from the beginning of this century that the synergy between theoretical and experimental researchers are depicting the ins and outs of this problem.