Spiral cleavage focuses our attention on the role of cell lineage in specifying pattern.

Even so, it is a very impressive example of the role of cytoplasmic factors and cell lineage.

Further studies indicate that these cells are derived of a novel cell lineage.

A continuous cell lineage can be replicated through many cycles of division and not become senescent.

These include insights into such problems as the tissue specific requirements of a gene, cell lineage, and cell potential.

This can enable a better understanding of mechanistic changes to specific cell lineages resulting from a particular experimental intervention.

"Having that cell lineage provides an enormous amount of information about the basic structure and development of the animal."

When carried out at single-cell resolution, this process is termed cell lineage tracing.

Several transcription factors have been isolated that regulate differentiation along the major cell lineages.

In this way, those cell lineages which require a specific gene can be identified.