Figure 2From: Left-right asymmetric expression of dpp in the mantle of gastropods correlates with asymmetric shell coilingExpression patterns of dpp in the trochophore and veliger stages. Expression patterns of dpp in (A, E, I) the trochophore and (B–D, F-H, J-L) veliger stages of the pond snail Lymnaea stagnalis, which has a coiled shell (A-D) dextral strain; (E-H) sinistral strain) and (I-L) the limpet Patella vulgata. (A, E, I) Shell gland (dorsal) view; (B, F) anterior view; (C, G, J, K) left side view; (D, H) right side view; (K) posterior view. (A, E, I) Broken black lines indicate the shell gland, and arrowheads indicate the dpp expression. (A-D, F-H, J-K) Black lines indicate the shell. (A–H) Expression of dpp is asymmetric in the shell gland or mantle edge in late trochophore and mid-veliger sages. (I, K, L) Expression of dpp is symmetric in late trochophore and mid-veliger stages. (J) dpp is expressed in the operculum gland. An, anterior; ap, apical plate; d, dorsal; e, eye; f, foot; L, left; m, mouth; me, mantle edge; op, operculum; P, posterior; Pt, prototroch; R, right; sh, shell; shg, shell gland opening; V, ventral; ve, velum.Back to article page