@article {842771,
	title = {Negative feedback mechanisms and their roles during pattern formation.},
	journal = {Cell},
	volume = {97},
	number = {1},
	year = {1999},
	month = {1999 Apr 2},
	pages = {13-6},
	keywords = {Animals, Body Patterning, Feedback},
	issn = {0092-8674},
	author = {Perrimon, N and McMahon, A.P.}
}
