Expression pattern of CESA gene mRNA in wild-type (Col-0) embryos at heart/early torpedo (A–D), late torpedo (E–H), and bent-cotyledon (I–M) stage. Hybridization with antisense (A–M) and sense probes (N–Q). A, E, I, and N, RSW1(CESA1); B, F, K, and O, CESA2; C, G, L, and P, CESA3; and D, H, M, and Q, CESA9.