Diagram of cortical localisation domains for the genes investigated in <i>Pararge aegeria</i>.

Simplified diagram of cortical localisation domains for cad (blue), nos-O (green), otd (orange) and ShxC (purple). Domains in red are hypothetical examples of where other maternal effect genes may localise to participate in maternal regulation. Notably a posterior gradient to coordinate caudal localisation (gene x) and a factor to specify the posterior of the germ cortex/band (gene y) may be required. The nucleus when in antero-dorsal position is also illustrated (n). Anterior is top and the ventral face is centre, while the dorsal face is split to the left and right (as indicated in black text). Germ cortex and extraembryonic cortex boundary is indicated by a dotted line.