MOESM6 of Reinvestigating the early embryogenesis in the flatworm Maritigrella crozieri highlights the unique spiral cleavage program found in polyclad flatworms

Additional file 6. The initial division pattern of micromere 4d is shown using live imaging data from an Axio Zoom.V16 (Zeiss). The 4d blastomere does not divide laterally but first divides along the animal–vegetal axis into a smaller, animally positioned cell, which we designate as 4d2 and a larger, vegetally positioned cell, we designate as 4d1.