http://en.wikipedia.org/wiki/Ascidiacea
A number of factors make sea squirts good models for studying the fundamental developmental processes of chordates, such as cell-fate specification. The embryonic development of sea squirts is simple, rapid, and easily manipulated. Because each embryo contains relatively few cells, complex processes can be studied at the cellular level, while remaining in the context of the whole embryo. The embryo's transparency is ideal for fluorescent imaging and its maternally-derived proteins are naturally pigmented, so cell lineages are easily labeled, allowing scientists to visualize embryogenesis from beginning to end.
A number of factors make sea squirts good models for studying the fundamental developmental processes of chordates, such as cell-fate specification. The embryonic development of sea squirts is simple, rapid, and easily manipulated. Because each embryo contains relatively few cells, complex processes can be studied at the cellular level, while remaining in the context of the whole embryo. The embryo's transparency is ideal for fluorescent imaging and its maternally-derived proteins are naturally pigmented, so cell lineages are easily labeled, allowing scientists to visualize embryogenesis from beginning to end.
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