Fig. 8. KNUCKLES mRNA localization in developing wild-type Arabidopsis flowers. (A-E) Sectioned flower buds or floral organs from buds at the stages indicated at bottom-left of each panel were probed with the short (3') antisense KNU probe, except the section inset in A, which was probed with sense KNU probe as a control. Hybridization of KNU transcripts and antisense probe is indicated by formation of a blue-purple precipitate. Scale bars: 20 µm in A, inset; 50 µm in B,C; 100 µm in D,E. a, anther; cw, carpel wall; f, filament; gy, gynoecial primordium or gynoecium; ov, ovule; op, ovule primordium; pd, pedicel; pe, petal; pn, pollen; se, sepal; st, stamen primordium or stamen; sg, stigma; s, style.