A blastula is an early embryo that has been formed by cleavage, or subdivision, of a fertilized egg. The fertilized egg, also known as a zygote, undergoes cell division that partitions the zygote into smaller and smaller cells. Blastula formation is...

The blastula is an early stage of embryonic development in animals. It is also called blastosphere. It is produced by cleavage of a fertilized ovum and consists of a spherical layer of around 128 cells surrounding a central fluid-filled cavity called...

It has been suggested that [Ca.sup.2+] events occuring during the blastula period of zebrafish development might be involved in mediating the cell-to-cell adhesion between the enveloping layer (EVL) cells and/or might somehow play a role in dorsoventral patterning of the embryo. Using the...

Early embryonic swimming is widespread among marine invertebrates, but quantitative information about swimming behaviors is scarce. Swimming may affect encounters with predators, positioning in the water column, and nutrient absorption. Measured rates and patterns of swimming and sinking for blastulae of four eastern Pacific...