In mollusks with an equal four-cell stage, dorsoventral polarity becomes noticeable in the
interval between the formation of the third and fourth quartet of micromeres, ie, between the fifth …

… Biggelaar JAM van den (1971) Timing of the phases of the cell cycle during the period of
asynchronous division up to the 49-cell stage in Lymnaea. J Embryol Exp Morphol 26:367-…

The formation of specialized intercellular junctions, allowing the passage of low-molecular
weight regulatory molecules, has been considered as a possible mechanism for regulating …

that the CO, programs originated from a few preliminary experiments, it seems likely that they
can be improved. In this way bett Page 1 that the CO, programs originated from a few preliminary …

… Verdonk NH, Biggelaar JAM van den (1983) Early development and the formation of the
germ layers. In: Verdonk NH, Biggelaar JAM van den, Tompa AS (eds) The mollusca, vol. 3. …

We have studied the intercellular communication pathways in early embryos of the ascidian
Ciona intestinalis. In two different series of experiments, we injected iontophoretically the …

Experiments were undertaken to investigate the cleavage pattern of eggs of Lymnaea developing
into exogastrulae after a treatment for 2 h with 5 × 10 −2 M-LiCl at 6 C at the beginning …

Early embryos of Patella vulgata have been injected with Lucifer Yellow. No restriction of
dye spread was found. We show that later in the development, the larval trochophore stage …

… Biggelaar JAM van den (1976) Development of dorsoventral polarity preceding the
formation of the mesentoblast in Lymnaea stagnalis. Proc Kon Ned Akad Wet Ser C:79:11~126 …

Most organisms develop from eggs that possess some degree of cytoplasmic heterogeneity.
The heterotropy of the ooplasmic constituents is used as a morphogenetic instrument as …