Val Wilson and Elena Tzouanacou discuss their interests in mammalian cell lineages and how they came to identify one such lineage that violates a strict assumption of germ-layer segregation, as described in their Developmental Cell paper. They also mention recent work that suggests how the behaviour of this cell lineage may be regulated to give rise to both mesodermal and neural cell types.

2009. Redefining the Progression of Lineage Segregations during Mammalian Embryogenesis by Clonal Analysis.  Developmental Cell.  Elena Tzouanacou, Amelie Wegener, Filip J Wymeersch, Valerie Wilson, and Jean-Francois Nicolas