in our understanding of how feather buds develop in The exquisitely beautiful form of a developing embryo periodic patterns in the ectoderm of the chick embryo is the result of a coordination between the driving forces (Crowe et al., 1998; Jung et al., 1998; Noramly and Morof morphogenesis and the processes of cell growth, gan, 1998; Viallet et al., 1998). The insights that have proliferation, ...