The gastrocoel roof plate (grp)and left-right asymmetry .It was of interest to determine whether frogs with different reproductive modes,and different onset of notochord elongtion
share the pattern of left-right asymmetry determination by cilia driven Auid Aow towards the left side in the grp,described for X.laevis (Blum et al.2014b;Saenz-Ponce et al.2012b).The question is particularly important because the mechanism of symmetry breakage by cilia driven Auid Aow in the grp or equivalent strucures is universal among vertebrates with exception of the chick and the pig.