The expression domain of PHANTASTICA determines leaflet placement in compound leaves (vol 424, pg 438, 2003)

Nature 424, 438–443 (2003). In the Methods section on page 443 of this Letter, a line was omitted. The sentence should read: “We determined antibody purity and specificity by western blot analysis on protein extracts prepared from wild-type and rs2 mutant apices.”