Fig. 1. Expression of LATERAL ORGAN BOUNDARIES (LOB) in as1 and as2. (A-C) Vegetative shoot of wild-type (A), as1 (B) and as2 (C). Compared with wild-type rosette leaves, which are elongate and spatulate in shape, as1 and as2 rosette leaves are round, lobed and with margins rolled under. (D-F) Side view and (G-I) top view of LOB GUS enhancer trap expression in the shoot apex of 8-day old seedlings. In wild-type (D,G) expression is restricted to a band of cells at the boundary between developing organ primordia and the SAM (arrow). In as1 seedlings (E,H) and as2 seedlings (F,I) little or no LOB expression is detected in the SAM. c, cotyledon; l, young leaf.